No chance, I need my RTG card. When I first got it I was using OS3.5 (which was the most up to date version available at the time). I had been using an autoscrolling PAL Laced1280x1024 16-colour workbench screen, flicker reduced with MagicTV and all running on top of CGX-AGA (you should have this with your BPPC disks) which did some of the things FBlit did. As it happens, that was quite a reasonable setup.
However, just 2 minutes of the same resolution at running in 16-bit at 85Hz was more than enough to make me realise I'd expanded the machine past a certain point of no return.
Incidentally, I wouldn't recommend the GUI settings in those screenshots for a Permedia2 card at any rate. Having such a slow fill rate, it doesn't do the compositing thing very well.