Getting in early!
I’ve got some Pearl Izumi Cyclone gloves that are nice and windproof but not very breathable so after a few hours I’ve usually got cold, wet hands. Ideally I’d like something that uses something more like Pertex than a membrane. Or I’ve seen the Montane Sabretooths using Powershield but would prefer something a bit more bike-specific I think.
Any tips?

Gore Alp-x 2.0?
I am on my second pair-the first lasted three years hard use.

For proper cold days seal skins are great

Those are both membranes aren’t they?
Also I had some seal skins socks a few years ago and hated them!

Yup, Alp-x are windstopper membrane.
I don’t find them clammy at all, just an excellent fit and comfortable for many hours use.
I haven’t seen any pertex gloves thb

I love my Endura Dexters. A sort of soft-shell, not quite neoprene material that seems windproof, comfy, breathable and quite warm even when wet.

I like the assos system gloves, although they’re now supremely expensive. I managed to buy some craft gloves a couple of years ago which aren’t too bad.

I’ve got some cheapo Planet X ones and they’re just as good as some Gore ones I had previously. Not that warm but i wear a thin liner glove when it’s proper cold.