My Gsus arrived today. I was planning to use 3203 for contact leaf and stem legs and 3204 on the rest, but a vial of 3203 I opened today appeared to be separating (it wasn't when I got it a few months ago) so I'll need to experiment.
As observed in some of the review videos, Gsus housing fits slightly tighter than OG Panda housing, tight enough to turn opening with KiiOpener into an exercise. I hate to be applying same amount of force to install Gsus into polycarb plate. For now, I'll insert the switches into brass plate as-is then open the tops using switch opener from mechanicalkeyboards before stem swapping and lubing.