Actually there is one GFX card that I know can have its RAM mapped to FAST: the PicassoII.
I have this small utility that does THAT! I've never done it because that would mean reverting to OCS+A2320 in WB1.3, or WB2.05
Likely, if I had any need to run 1.3 on 68000 I would then have to either boot off WB floppy with this Picasso-remapper on it, and I would then have 2Mb FAST.
That doesn't appeal (1.3 won't work with the 060+SCSI) so I guess I'd just stick with OS3.1 & OS3.5 with 64Mb FAST! :-D