Hello and welcome to the forum!
I’m guessing you’re still after a bracelet and I can’t offer any suitable guidance there, save that a Milanese style bracelet would be highly adjustable and you might find one that tapers as you prefer (I use watchgecko ones but they have no taper - I think vintage Omega ones did). Milanese are also super comfortable and thin, so a lot less bulky than your current option.
Have you considered a smart leather strap as an alternative? 20mm is such a standard lug width there are loads of aftermarket options out there, and even picking up a vintage Omega buckle to pair with it isn’t that hard (though an authentic one might cost far more than the strap…). You can get straps that will taper to 16mm and even less no problem.
I’ve always worn my Cosmic 2000 on leather but it’s a different shape case. It says hi anyway:
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