Using Black Hawthorn as Rootstock

I've always been told that hawthorn is great rootstock for pears, medlars, and quince. But now that I'm getting ready to graft, I'm reading more about graft failures, at least for pears. We already have a thread about hawthorn in general as rootstock, but I'm curious about our native hawthorn here in the pacific northwest, known as black hawthorn (Crataegus douglasii)

I'm really mostly interested in using it for quince and medlar, or even chinese hawthorn. Thoughts and experiences?


https://permies.com/t/51054/Grafting-Hawthorn-Crataegus