Can you share any pictures of those brushes after they have bloomed and been used a few times? The Semogue I have owned end up looking kind of frayed after a while.Great choices and I feel exactly the same about these knots and handles - the 507 isn’t comfortable for me either.
One thing I think you would also like is a Semogue 610 or 820 (or the 620 and 830 if you like a badger-esque black band on the hairs). They are super value, small and fun to use, and really nice quality handles. I think they’re the ideal boars for face lathering.
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The Zenith silvertips that you have your eye on are excellent badger brushes if you favour a soft, non-prickly knot (as I do). They are seriously good badgers by any standard, and very fairly priced. If you like a bit more backbone and some gentle prickle then their manchurian knot is the one to opt for.