Hi,
Erm... I don't know about IC design, as you know. A month or so ago I was mucking around with a discrete component (1.25V shunt ref of TLVH431, another shunt as inner supply regulator of 2V, pnp as enable, OA EA with OPA322, npn drive and pnp pass transistor rubbish but effective to overcome no model for LDO needed) linear nearly-LDO regulator of 10mA to 1.3A load in a simulator and added type 3 compensation to the EA and it seems to be very stable and have good transient response like load step, line regulation and so on, but then it is only in simulation-land so who knows... Certainly better behaviour than with no compensation. I think that's no use to you as you do not want external components, although onboard compensation R and C could be small or type 2 compensation?
As I said, way out of my depth so sorry if reply is naïve nonsense.