For what is worth, jacking the leading edge of the horizontal stab up and down comed with its own set of issues. Both Cessna and Piper did it and then went back to trim tabs. A moveable stab turns out to be mechanically more complex, heavier, and you have the control creep issue. Both moving stabs and trim tabs have to hold the settings that the pilot selects. Cessna found out that jackscrews creep as much as a trim tab mechanism, requiring the designer create artificial friction in the linkage.

So you may want to compare the parts count, parts complexity, and weight of the two approaches.

Best of luck,

Wes
N78PS