is there component video support in any capacity, either through custom cables, a HAT or anything like that?
It's called a
SCART to Component adapter and they've existed for about 20 years now.If you have need for component, I highly recommend you invest in one (not Playstation hats and HD Retrovision cables).
IMO HAS is perfect just the way it is (8pin mini din RGBs) the only reason why I own a HD15 hat is for the Taito F3 workaround with OSSC...
And that's to solve an issue with the OSSC, again HAS IS perfect just the way its is... Its the OSSC that's flawed.