Reynaud's here also. 25F to 35F days I have been experimenting lately. Pair of cheap thinsulate lined leather gloves from closeout store with manzilla liner and kept warm. No numbness. Dexterity great as they are not that thick overall and hands could function easily after ride of an hour. Hands stayed dry and gloves were not soaked after ride so they did breathe a bit. Don't think they will work that well under 25 deg F.
Above taken on windy day with some clouds to mostly clouds. If it is 30 and the sun is shining with no wind I can easily get by with the liner and the open finger bike gloves.

Manzilla under open finger bike gloves good above 35F.

Tried a pair of cheap "waterproof" thicker gloves ( I use to use for snow shoveling before I finally switched to ragg wool mittens ) and my hands were soaked after 20 minutes. I think there is plastic shell inside to make them waterproof. No good as they don't breathe. Dexterity poor

Do the nitrile gloves make your hands sweat?