Cool topic and i understand what you were trying to convey just fine. I would love to learn so i will look forward to watching this topic.

I'll start with my native language, German:
dw learn german: https://learngerman.dw.com/en/learn-german/s-9528
free. different resources for beginners, intermediate and advanced. courses are semi-accessible, exercises with pictures or videos can not always be answered unfortunately.
germanpod101: https://www.germanpod101.com/
freemium (some content is free, some is paid). havent used this specific language from the pod series, i cant really tell how good it is. lessons generally are in audio form and are mostly 15 mins long. you also have exercises in between the lessons to test your knowledge.
german phrasebook from goethe verlag: https://www.goethe-verlag.com/book2/EN/ENDE/ENDE002.HTM
this is an online phrasebook/small vocabulary guide. click on the button, not the button link, to play the audio of each word or sentence.
babbel: babbel.com
has german  courses. the site is very accessible, ios app is not. platform is subscription based. courses are very accessible except a few visual questions.
coffee break german: this is a free podcast in the cofee break language series. havent listened to this one. you can get bonus content by subscribing to the academy.

Here are some resources for learning the Klingon language, because why not? It's a constructed language, but it's a language all the same. The following is from a Klingon learning resources thread I started quite some time ago, but slimmed down a bit to exclude the rather lengthy descriptions.

First up are the official resources which teach the basics of the language.

The Klingon Dictionary by Marc Okrand is the first published resource on the Klingon language, and can be found here on Amazon.com. Those in the US who are signed up with Bookshare can get this from there as well.

Next on the list is Conversational Klingon. This is also written by Marc Okrand and narrated by Michael Dorn. It can be found here on Amazon.com as an Audible audiobook. It's more of a language learning course.

Power Klingon, Also by Marc Okrand, continues on from Conversational Klingon, but I haven't been able to find it legally in digital form.

Next up, we have Klingon for the Galactic Traveler, yet again by Marc Okrand. It can be found in Kindle form here on Amazon.com. If I recall correctly, Bookshare also has this.

Finally, we have The Klingon Way: A Warrior's Guide, written once again by Marc Okrand. It can be found here as an Audible book.

And now for the web resources that I've found.

First, we have The Klingon Language Institute, a nonprofit corporation that exists to facilitate the scholarly exploration of the Klingon language and culture. A paid membership lets you access a Klingon course of sorts, and you can ask questions about the language. Note that to access the menus, you'll have to hover the mouse over the links or use whatever command your screen reader of choice provides for that.

Next is Klingonska Akademien. Yet another great resource about the Klingon language, this site includes transcripts of the various published books and tapes. You will need to prove that you have access to said books and tapes to download said transcripts for copyright reasons. There's also a section on Klingon songs which I think is pretty interesting.

Next on the list is Hol 'ampaS, yet another great resource about the Klingon language maintained by the Klingon Assault Group. Lots of stuff here.
And finally, there's this. Learn Klingon The Easy(ish) Way. A recording of the Vialingo Klingon course, released under the GNU Free Documentation License. I'm not entirely sure if they ever completed this, but it's an interesting video series. There is, of course, the normal Duolingo Klingon language course as well.

to post7, the only solutions I know are microsoft japanese voices. from the settings you can get them from the voices panel, i think. I haven't foun a pro talker pot for the latest version of nvda, so unfortunately i think that's the only thing you can do. But at least with microsoft voices I got an european portuguese voice with actual vowel reduction because the one in eSpeak wasn't even close to that. Microsoft voices aren't of such a good quality, but I think those are the ony voices better than eSpeak right now.

I don't know if the Klingon spoken there is real or not. Many shows, Star Trek included sometimes, have writers who will skim over the dictionary and come up with something that sounds Klingon, but it's just nonsense.

Edit: Oh huh. It is real Klingon.
https://klingon.wiki/En/TheBigBangTheory