Were it up to me, I'd release the unvoiced version first and then provide voices in a patch later, if VAs are getting hard to find.
There's one Neptunia fangame I follow which did something like that. The guy released the full game with some of the audio out, and then a second version with the audio in. I think he did that because the audio was being weird with compression, but w/e.
There's also a RWBY fangame I've taken an interest in (JPDE) which got the main script of the game done, and then they gradually added voices character by character. That way a VA can do all their lines in one go, and their future willingness to do more lines isn't too important. I think those devs are focusing on specific characters for each update now.
There's also the Falcom way of voicing games, where there's so many voice lines, only the important scenes are voiced.
Of course, I favor the unvoiced first/voice later option, since that means I still get a full game in my hands even if the original VAs never show up.
Oh, and since I live in the US, a State ID exists if you can't get a Driver's License for whatever reason. Since a fantasy character isekai'd to our world wouldn't know the rules of the road, a State ID would be their next best option to present their identity. And of course I would exaggerate a bit that the cops are authorized to grant those. ;D