Well if you like Slic3r you should check the fork from it called SuperSlicer. Lot’s of very cool features.
https://github.com/supermerill/SuperSlicer/releases
Duet’s are good but I don’t like paying their HW prices so run other boards with Kipper, a Pi 4, and a front-end like Fluidd.
All my printers are custom built so having open source for everything is very important to me.
It sounds like you are more adventurous in this than I have been. And my wife has managed to keep my completely natural hoarding instincts under control in this area. Basically, if I want a different 3D printer I will have to get rid of the one that I have got already. I put together a jumbo sized Creality type printer for a friend with a 300mm x 300mm x 400mm print area. I added the self leveling feature and had all sorts of difficulties getting the right firmware installed on the motherboard and rewiring to support that. We had it at our house for a couple of months while I ran it through it's paces. And I was kind of pining for one myself, but my wife was not enthusiastic about the idea.
Even though our bedroom is two stories above the room where the printer is kept she still whines about it when I have a long project printing through the night.
Yeah the duets aren’t cheap but they work well. I have kossel printers and they are a whole new level of fun. I have an rpi configured as a router to the duet ethernet. It’s on a private subnet. I’ll have to check out superslicer.