Thermal lined GoreTex gloves (textile/leather mix) with long gauntlets to fit/seal under/inside the (expandable) jacket sleeves...
Additionally thin under-gloves (elastan), not only to add another layer, they also ease slipping in/out your gloves, especially when you got wet/damp fingers (like from working your jacket closures during a tank-stop in the rain), they will then also prevent pulling your glove liner out (which basically ruins every lined glove right there...)
Yes, you'll tear those thin under-gloves apart rather quick (like when they got stuck on a Velcro), but for under € 10,-/pair (vs € 140,- for quality GoreTex gloves) I rate them consumables and pack 2~3 pairs for a tour...
But keeping your torso as well as your neck and head warm helps maintaining blood circulation in your extremities...
Got a transtex/windstopper neck-warmer reaching up to my ears, sealing all between chest and helmet rim...
Designated functional underwear and thermo sweaters to build several thin layers (providing better insulation then one thick liner) do a lot...
And all those modern, breathable while insulating fabrics work really great...
At first my GF frowned about the costs of all the special garments I suggested... now she even declined installation of grip-heaters on her NT...