There are so many options out there for a rock climbing harness, I would go to a climbing store if you have one close or an REI and look at a bunch even try a few on.
@bowhunter15 has a video where he adds a lineman belt to a rch, I'll see if I can find the link. He also talks about a weighted back loop for the lineman belt.
Stepping through the leg loops never bothered me, just make sure to get an adjustable one so it fits when you're wearing all that extra clothing.
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