The diode/br trick works ok.
If you insist on creeping, Electronic Railroads tmcc convertions might be in your future.
The LW is the strongest PW single train transformer Lionel made at 125W.
I think it could pull off running tmcc well enough.
Accessories should be ok too.
If you see performance suffer, or lights dimming too much when using accessories, a small supply to supplement it would be nice.