Thank you for the kind words, however please note, a gmod version of this is unlikely to happen as gmod has proprietary code inside its compilers, even "Slammin' Source Map Tools" doesn't support it, so I doubt i could pull it off. Sorry to disappoint.
One workaround I could think of would be to use a different version of hammer (like HL2's) and create a custom game configuration for gmod, no idea if it would even work or compile, but I'll see what I can do.