You do live recording on the guitar?
Okay… i was busy with an advanced video about Renoise and Reaper and synchronising it.
In that manner you can then use Renoise to perform the sequenced stuff and use the recording option in Reaper to time it then you can play your whole concept from any arbritrary position from within Reaper.
Meanwhile, I got some explanation and pictures that already can help you out further down in the thread here:
https://forum.renoise.com/t/syncing-renoise-to-reaper-or-other-sequencers/20784
Maybe this can help you out making it a bit less ackward for the time being that Renoise has no native sample synchronisation routines.
Btw the newest version supports MIDI slave mode which makes it a lot less ackward and control Reaper from Renoise.