I tried something as an experiment. On my Mac Pro 5,1 (spec below) I have parallels 14. I installed an image of OSX 10.6.8 server (the minimum OS supported) complete with Rosetta (original rosetta) . I can now run PPC software quite well in a window whist running Catalina on my mac. It seems pretty good so if there are any old programs your attached to you could give it a go. Oh, I first tried it on a 2013 imac with an ssd and the graphics were a bit slow and querky. But no problems on my mac pro...