Around 50 mph. If the RV-14 can cruise near 200 and stall in the high 50's I don't see why you couldn't have a high wing that does 175 and stalls in the low 50's.
I am sure you are infinitely more knowledgeable about this than I, but I think a high wing benefits less from ground effect which plays a part in landing speeds.
You say “low 50’s” while I said below 50 (which is still very fast for a backcountry plane), so low 50’s could be construed as 53, while below 50 could be 47, that is 7mph inclusive and that can be a lot in a backcountry scenario unless you just want to land with all the Bo’s and low wing RV’s at 3U2.