2. There is a test version for manifest v3 which should work for chrome in can you don't want to migrate
Yes, it seems like this version of the extension is still working and 22 users have added it so far or 23 including me.
I just tried it and it worked for me with Chrome. I also browsed some discussions on the official bpip.org thread, and found some user including the OP seem to be unable to use it. But I'm curious, have you enabled developer mode?
The steps were pretty simple: I added it to Chrome, checked a few options to show, enabled developer mode, and updated. That worked for me.