The 109/190s worked trim by shifting the entire surface up or down. The elevator could be completely removed and you would still be able to trim up or down. The surface was hinged along the rear end and a screw system was used to mechanically shift the forward section up or down to change the angle of the stabilizers.
Attempting to fly back to base in the scenario with no elevators in a Fw190A8 I was really wishing we had this for 3-4 sectors. It's not the first time I've wished for it. It won't be the last (unless HTC grants said wish, in which case I stop wishing and start enjoying).
Can you please model the trim on these planes specifically to still work when elevators are shot off? It's not going to be any sort of magic bullet or any solution that lets you easily fly without the elevators. It will still take skill. It simply adds a fighting chance and is historically specific to these 2 planes. (3, if the Ta152 followed suit? I cannot attest to this, so have left it out)