Teach the chants in English, that is translate them, kept the beautiful sound part in the translation.
I heard a beautiful English translation of the Exultet by a deacon who transfered from another parish about close to a year ago Holy Saturday. If that can be done, then the chants can be done in translation.
Part of the problem is that some of the chants don't translate well. It's generally the case that music fits best in the original language. And most singers will tell you that the roughest language to sing in after French is English. It's true. Latin is pretty easy IF you hear it all the time, which is a big issue. I'm a classically trained singer, so I can actually just ask which IPA sheet are we using (none of them are actually what we sing in church), but I am completely cognizant that this is more the exception than the rule.
Make that IPL sheet. I had rehearsal tonight.