I had the similar set up. I felt like there had to be a screw in the there that I could access from the front. I was wrong and figured out for my situation to apply vice grips around the front shaft and turned it counter clockwise and that actually took the whole valve out. Now I can't get the set screw out....plumbing is funner when there's someone else to watch do it.
Try heating the handle with a torch.
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Did you ever get it off? Having the same issue.
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