Perhaps this CPP Offset Power Brake Booster Kit, which says it moves everything 1-1/2" towards the drive side and 2" up (from the normal straight out position) would give you enough clearance? It's designed for 1948-54 Full Size cars, but I think it could be possibly adapted to your planned application. Picture below shows the rear view of the unit to show the offset bracket and rod assembly.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
it could be possibly adapted to your planned application. Picture below shows the rear view of the unit to show the offset bracket and rod assembly.
