I agree, I've never been a fan of the poor selection of inserts HW offers for their front sights, and their diameter and side tab pattern is proprietary - no other brand will fit. Seems to me the market is wide open for some enterprising sort to offer some photo-etch alternatives.
I use ring inserts for target work, but my personal fave for old-guy all-round plinkerating is a tapered post with a bead on top (FWB and Diana ones seen here):
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