Grafting Black Cherry (Prunus serotina)

Hi all,
We have a number of small black cherry trees here on the homestead---most are 5-8' tall.  This winter, I'm thinking about grafting them with some sour cherry varieties. However, some of the things I've read in other places seem to suggest P. Serotina is not compatible with the domesticated cherries.

Does anyone have experience doing this and can share insight?

Also, like other grafts, I assume I can do this in Pennsylvania (Zone 6, USDA) till the buds start popping in April.  I was thinking of doing this in early February.

Thanks!