I guess I could add this to my to-do list one day, but since the only Android devices we have are owned by my boys and I couldn't even find a working manual rooting howto for them (Huawei Y360 & Samsung Pocket) I can't say it'll be Replicant for my boys any day soon.
Other than those devices my old G1 ADP1 (HTC Dream) still works with some older Android mod (can't remember what it was) but isn't exactly used anymore. My wife has my old Jolla(First One), and I presently use a Jolla C phone. They both use the SailfishOS so there's no real need for Replicant as SailfishOS is a full-fledged Linux system.
Edit: I forgot, I have a Galaxy Tab A6. Might want to install some cool Linux on it though. ;)
I should really stop adding thinks to your todo list. It will grow way too long. ;-)
There is a list of supported devices for the Replicant system, which you can find here: http://www.replicant.us/supported-devices.php
SailfishOS is a very good start but even this system contains some proprietary components. However, I'm also very excited about it and would love to see a fully free system based on SailfishOS instead of Android one day.