I have just posted these plate holders to thingiverse for the Fleks 3D build plate (The 8 Inch Delta version):
I initially used magnets to hold the plate in place, but that became troublesome with larger prints as the print head would hit the magnets. This works much better and only requires 2 plate holders due to really tight tolerances.
The only problem is that self-leveling appears to struggle. I get around that myself by using gcode from Simplify3D and I’m getting some exceptional prints with no warps and very consistent wall structure. But it would be nice if you could turn off self-leveling in Flux Studio.
I can finally say that glue sticks have become banished from my setup!!