OK, unless your amplifiers are operated pulsed mode
this looks more like a simple supply sequencer, "human
in the loop active bias" kind of application.
A few phased array element controllers I've done, had
the drain switch and active bias control features. Any
pulsing was done by the panel, by enable signals.
Active bias amp always starts from pinched off and
drain current is the servo'd quantity, ramping from zero
after drain switch closes.
I'd bet you can find an active bias controller chip for
MMICs incapable of controlling their own Vg suitably,
pretty cheap.