Thank you for your detailed response @oscar .
I have never grafted pear to quince before. As long as you use a known compatible variety of pear, is the success rate about the same as with pear to pear grafts? or is grafting pear to quince more finicky and prone to higher failure rates?
I think all my Euro and oriental pear grafts took last year. I have 5 Quince C on order, so I’m hoping it is as equally cooperative. Keeping my fingers crossed. 
in my experience if using compatible varieties grafting on quince has same success rates as on pyrus. Even with incompatibly varieties i expect decent take. The incompatibility is often delayed.
Oh boy, I may have just set myself up for failure
I’m in my first year with an ayers, grafted to quince.
Right now it looks good, but in 3 years I might be SOL.
I’ll report back what happens.
I was thinking about grabbing a Warren, a Potomac, and a Turnbull all on quince next year. I see Warren is quince compatible. does anyone know about the other two?
Edit: I completely forgot I got my two Asian pears grafted to ohxf 333. Complete brain fart.
Is Ayers not compatible with quince? I was looking at the compatible list above the other day, but Ayers was not on it.
I’ll find out eventually I guess. LOL. It’s growing really well right now. It’s probably about 5 ft tall, with two main branches
If you are not sure just do an interstem. Pear interstems are very easy, just wedge graft a quince-compatible scion on to the bottom of the scion wood you are not sure about, and then view that package as your “scion” and immediately graft it however you like to your stock. Knock any buds off the interstem. I’ve had near-100% takes. The only extra thing you need is some wood of a known-compatible pear.
How long do you allow your base root stock mend together with the inter-stem? Before adding a scion?
I made some P.2 / M111 trees. Thinking of doing P.18 and P.2 or P.22 next season.
Perhaps I should add BA-29C and a compatible scion to get them started too.
I immediately graft… no wait. That’s what makes it so easy. I put the interstem on the scion first not the stock.
Oh wow. I thought you had to let them grow in first. Good to know! Thanks.