Do you definitely need 150hp?? Would you consider a Rotax 912 series engine powered a/c?
Within the LAA , there are lots of STOL types with 100hp 912 engines that’ll fit the rest of your requirements. If you want 150 hp and an LAA Permit I kind of feel like you’re limiting your options.
Most two seat 100hp 912 aircraft will perform (in terms of STOL) even better than their 150hp Lycoming machine equivalent and with much less running cost too.
A Jodel 140 would suit you perfectly, but good luck finding one. Roomy, powerful (160hp), fast, and great off strips. Uber cool too.