Smart man! With my increasing age and decreasing strength, 54lbs is indeed a load to lug, but still worth it for the important gigs (a large wheel luggage cart helps). For rehearsals and other gigs I use a Fender Blues Jr. III (31lbs), but it doesn't have a separate input for BIAB. Do you play BIAB through your guitar amp, or use a separate PA system?
Cheers! -Alastair