I am interested in the answers, though for myself I mostly plan on just letting my loquat seedlings grow to maturity without grafting.

In my experience, loquats breed fairly well true from seed. And they don't take all that long to reach maturity, relative to other fruits.

I've got about 5 seedlings going, and just planted about 20 seeds from this year's fruit crop.

gb,
Are you grafting onto loquat seedlings or quince?

Had a chance to sample my first loquats, while visiting my son in Tallahassee, back first of last month. I got the bug.
Not winter-hardy here - though my BIL's mother, at Wetumpka AL has one in her yard that bears annually - and she's probably at about the northernmost level where they'll fruit (from what I've been told).
But, from reading, it's evidently compatible with quince, which will dwarf it, and supposedly, foster earlier fruiting. I've planted some seeds from the fruits I ate, but certainly considering sticking some quince cuttings and trying my hand at grafting/budding onto them and trying 'em as an indoor plant during the winter.

It's actually easier for me to get plants or scions from improved selections than seeds from them, so I am going for grafting. Good luck with the seedlings. The many ornamentals around here have such a great variability in size and taste that I was a bit wary as to how closely fruit quality runs from seed.

Lucky,
Mostly onto seedling for friends and interested acquaintances here, but if my orange quince is the right genus (I believe it is) I will start some seedlings with the fruit on it now to try dwarfing at some point. If you get into this with the protected plant I will probably have a half dozen named selections soon big enough to spare a scion or two each for multigrafting.

Thanks, p.
I'll touch base with you off-list.

I've got some seedling quince, grown from *supposedly* non-astringent middle-eastern selection - I've had good success just sticking pencil-diameter prunings in the ground before they break dormancy in the spring, with high rooting/survival rates. Not sure if that's a feature of the species itself, or just the fact that these are still in their juvenile phase, and root readily as a result.
Grafted several over to pears a few year ago, but probably still have a number in the nursery row; might try rooting some in pots now, just to see if I can get some going for attempts in a year or two.