Since I am blogging at the moment and will be for the indefinite furture here is what I wrote about the Vackar oscillator circuit: https://sites.google.com/view/analogelectronics/home/vackar-oscillator-circuit
You can use it as a good basis for a regenerative receiver, the capacitor divider circuit could linearize the bahavior of the FET to the point where the circuit will not suddenly "pop" into oscillation, and of course for a regen you need to find some way to control the gain of the FET. With an indepenent AM detector coupled to the resonant inductor it could work well.