I haven't used it yet, but a quick search on F-Droid showed https://f-droid.org/repository/browse/?fdfilter=dialer&fdid=org.dnaq.dialer2 https://f-droid.org/rep

I haven't used it yet, but a quick search on F-Droid showed https://f-droid.org/repository/browse/?fdfilter=dialer&fdid=org.dnaq.dialer2 https://f-droid.org/repository/browse/?fdfilter=dialer&fdid=..., which looks promising. I fit still works on a current android, but at least F-Droid marks it as compatible.