Thanks, @aforkosh. I am aware of Retroactive, and that’s what I plan to use when I finally upgrade from Mojave later this year. I was so relieved when it came out, as it gives me more time to procrastinate thoroughly research my options. And importantly, it removed a big blocker for me moving past Mojave. I have a couple of other apps I’m in the middle of migrating away from, but once I have my plan is to use Retroactive to bring Aperture forward.
As you say, though, this isn’t a long-term solution, just something that will ease the transition and give me more time. Already RAW Power has added DAM features, and my hope is that in time they will add enough that it becomes a viable option for me. I’m still also considering some of the apps in this thread. C1 is attractive, but not sure I can afford it for my limited usage. It’s very helpful reading other peoples’ experiences, and I look forward to reading @angusC’s journey.