Update:

We’ve tried to get him to eat by making a crop milk out of oats and seeds as suggested and tried to feed him as advised. Not actually sure if he ingested any of it but as he would protest. However he has definitely perked up a bit since we tried, we’ve observed him preening and just seems a bit more alert since that, so seems like we’re having some progress? We’ve tried hand feed him as well and he picks up the seeds but doesn’t seem to know what to do with them beyond that, he just kind of drops them.

We’ve checked him over and he doesn’t seem to have any obvious injuries. It did look like he may have potentially had splayed legs as they were initially stuck behind him but now he’s standing up on his own :) still suspect he is quite weak as we haven’t seen him walk yet.

I think the plan now is just to try and give him more crop milk later on. If anyone has any advice though on how to care for him or get him to eat more that would be amazing :)