Unfortunately, the GW Delalum bushings won't fit the Hotchkiss arms, they're designed to fit stock & GW arms. I'm pretty sure I've seen other brands of Delrin bushings. They might fit. FWIW, no poly bushing lasts a lifetime. People do get very good mileage on them, especially on cars that only get occasional use, but they all turn to mush eventually. Either way, it's not likely to ever be a problem on cars that aren't daily drivers.
I have no experience with these guys, but they custom make Delrin bushings:
http://www.paeco.com/Delrin%20Bushings.htm
Tommy