This might not be the best code I ever done, but at least, it does the job pretty well : SDCC2Pasmo takes as input a .asm file generated while compiling C code with SDCC, and outputs an other .asm file that is compatible with Pasmo, Maxam or WinAPE assembler syntax.
Command-line usage: SDCC2Pasmo sdcc_output.asm pasmo_compatible.asm.
C++ sources for Windows are now available through Productions section of this website, so feel free to recompile it for your favorite development environment if you need to.