You don't need to lock or unlock. Try these do-nothing replacements.

local fn LockGW( p as ptr )
end fn = _noErr

local fn UnlockGW( p as ptr )
end fn = _noErr


> Further...How is a 1 bit GWorld from FN NewGWorld different from a bitmap from RP's fn NewBitmap? ?

IIRC, a GWorld is a PixMapHandle + various information such as bounds and colour-depth.
A BitMap is a naked 1-bit PixMap.