Skywest.

try this. ive done this before.
lets say song is key of C and you want 2 bar count in for a song with no drums.
1. open up your bb song in chord view.
2. insert 2 bars of C.d at beginning before your current bar 1.
so now the actual song starts at bar 3 instead of bar 1.
3. at bar 3 use F5 to mute the drums. (so they only play first 2 bars.)
3. do a F5 at new bar 1, and select , to your hearts desire whatever simple drum style you want.
will this not work ?
OR lets say instead of a drum lead off you want an instrument lead off.
eg piano.
same idea but use C.p for 2 bars etc etc.
select a piano patch or guitar scratch or whatever your hearts desire.
just experiment. also with midi patches and F5 at bar 1.

best.
oldmuso.
ps its early here. so if this dont work, and it should. apologies/i'm waking up. i'm getting my vaccine today.
yippee !

my songs....mixed for good earbuds...(fyi..my vocs on all songs..)
https://soundcloud.com/alfsongs
(90 songs created useing bb/rb)
(lots of tips of mine in pg tips forum.)