Any improvement is worthwhile. You are looking at temperatures way beyond what semiconductors can survive so I still think you will need to choose a really good epoxy for it to have useful strength at 200C near the coil.

Not quite the same thing as removing heat from ICs but your experience at least gives you a head start over the rest of us.  If you can get a potted version that dissipates the heat as well as bare coils you have made good progress, if you can beat it you are on a winner as bare coils are not really practical in most environments.

Keep us posted with results, even the die hards may accept it if you do the work and prove it.