For my OSR2, the stamina FL came in a gold case, which took a little electrical tape to help it stay snug, but it was always threatening to fall out, and came sorta loose on a couple of uses.
I resolved it by getting the 3d printed heated case, which is considerably less flexible than the original FL case. That holder locks in place and doesn’t budge.
I know that the SR1 doesn’t have the connection to power the heated case, but that might be a better option. Maybe Renwoxing could add such a FL holder as an accessory?
There is no plan at present, but there may be plans in the future. I’m currently working on customizing Onaholes. If I can succeed, I will introduce the heating function for the Onaholes itself, because the effect of common heating methods is not very good (the heat insulation ability of TPE is too strong).