Hi, R. Benyamin!
I do not have a Yeshivish background, but I have a very good friend who grew up Haredi (Breslov).
I’d be happy to put you guys in touch, and to chat generally. I am available on WhatsApp at +972(0)525682299.
Also, I know an Orthodox guy from Monsey who’s been having a hard time finding catachesis. If I remember correctly, he’s also Litvish.
Yarden James Zelivansky.