Efke makes some thick emulsion films, though I haven't seen them in 35mm.(posted 8669 days ago)You could try: TMax 3200, expose at its reall speed (800 to 1000) and develop in Dektol for maximum grain.
I don't know of any films without anti-halation dye or backing for 35mm. There are a few for sheet film (mostly slow speed copy films).
Another thought: use Kodak Infra-red, but filter out the IR. Just use the visible spectrum. It's grainy, and so-so in sharpness, with limited tonal scale.