Rooting dormant raspberry cuttings

I recently requested germplasm of some rare native raspberry brushes from the USDA grin database. They send them bare without roots and I assume in a dormant state as I couldn't even request them until Sept 1.

I have two books on woody plant propagation since I can't afford these cuttings to fail. I'm starting a raspberry breeding project.

I think I'll go with half peat, half perlite, and keep them in sealed bags to keep in moisture. The heated mat and cool tips sounds good,  but do I keep them indoors or outdoors the whole winter? In dark or sunlight?

Any tips would be appreciated.

My general strategy for rooting cuttings is to root them in pure coarse sand. I suppose that if it were me, that I'd dig a hole outside, fill it with sand, stick the cuttings into it, and make sure that they stay damp until they root and sprout. Perhaps, I'd fill a pot with sand, and bury that in the ground outside. Raspberries thrive in partial shade, so I'd try to mimic that in my planting.

Thanks.  I think I'll try something like that with a pot.

From what I read the most important is drainage (pore space) and moisture.