I have no problem with your wanting a stricter hashgacha, but I think characterizing Gush Etzion winery as just rabbanut is misleading. They have a rabbanut mehadrin hashgocha and the OU. I just wanted to clarify that for others who might read the thread. Hatztlocha rabba!
Golan Heights Winery in Katzrin is beautiful. I’ve been there. The brands they produce are Yarden, Gamla, Mount Hermon, and Golan. It’s about a two and a half hour drive from Jerusalem.