When reaper locks up, in the Task Manager you can right click reaper.exe > Create Dump file
then zip it up and post in the reaper forum and they maybe able to tell you what's wrong.
You can try it in
KV Element in Reaper
load element as a vst3 plugin then drag and drop the BBPlugin into it, hook the in/out up then click the EXT top left to sync it.
You can try
Band In A Box Track Injector for Reaper