Yeah, choke loading is a really good thing to do to enhance linearity. Works the same magic as a constant current source.
It is possible to do with a Cornet. Just keep in mind the EQ will shift accordingly. The existing circuit carefully balances the need for the plate load to be both high impedance and low impedance at the same time. You need high Z for tube linearity. Low Z for low noise, better controlled EQ, and lower grid current issues in the following stage. If you look carefully, the plate load resistor is actually quite high, equal to the grid bias, and about the same as the tube Rp (without cathode bypass).
If you do try it, please let us know what you find out.