With
hint_ram_based=0

I get glitches in some wma and mp3 but wav flac and ogg are ok

with
hint_ram_based=1

they all play fine

Same as Sforzando has this option you can have this option in the BBPlugin as each instrument is not sourcing that many different wav's.
All this will work so much better than the crappy waiting time as it is now.
This could all be done right now.
You have a golden opportunity to bring about profound change.
The BBPlugin don't need to wait for wav files to be rendered for it !
It just reads the original WAV Instructions and plays instantly same as Sforzando, if an export is needed it just renders to wav.
Drop the sfz into:
bb\RealTracks\Guitar, 12-String Acoustic, Strumming Ev 120
then drag into Sforzando
you can try it with wav flac ogg (Reaper has a Batch converter)
in the sfz just rename all the
sample=AG1141.wma
in a text editor to the file type you are using.

Right Click Save Link/Target As
Guitar, 12-String Acoustic, Strumming Ev 120 - wma.sfz
Guitar, 12-String Acoustic, Strumming Ev 120 - ram wma.sfz

the
offset=705600
end=1058400
and
loop_start=705600
loop_end=1058400

is just the sample position in the RT file to loop
in Reaper you can right click on the clock and set it to Samples
make sure the project is set to 44100.

This will also work for Live Arranger !