Not sure if it fits your overall design goals but I just got my LR3 working w/ Skr mini e3 v3
Cheaper than an Octopus - I think I paid like $85 for both the board and the tft35-e3 on Amazon; board by itself is like $45 and I’m sure much cheaper when purchased direct from China in bulk.
Only has 4 stepper drivers but the Z driver is multiplexed to two channels for dual Z already so it was a non-issue for me. Sensorless homing was really easy to set up - just a few jumpers and maybe 2 tweaks in marlin (extruders 0 and the sensorless homing stuff in the advanced config file).
Relatively painless, pretty cheap. Works like a charm for me