i hate to suggest this, but make some caffenol c real sloppy and add print developer to it ..
don't measure any of your ingredients ( THAT'S KEY!)
and add print developer to it, make sure print developer is spent, kind of brown it will work best that way ...
( this works great with black ansco 130, if you have any of that USE IT or add about 11g/L of glycin to your dektol, they are similar )
overexpose your film by about 4 stops and stand develop it in your soup for about 25-30minutes ...
make sure the developer is kind of warm ... ( above 68, less than 75º )
with sheet film you will get VERY dense film, but with roll film, nice contrast, fog/stain and prominent grain...
you might do this without the coffee &c and stand develop your film in half spent, half fresh dektol
maybe dilute 1:10 for about 25 mins, agitate every 12 mins ... or do it in the coffee stuff for half the time
and then your dektol 1:7 for half the time ...
change developers mid stream something harsh, something not harsh .. as bill said, you want to wreck your film !
if you can get away with not shooting your subject full frame stand a bit back and let your
composition swim a bit in your frame so you can use the magnification to your benefit.
sounds like a fun project !