I don't have a hybrid and I am not really familiar with the topic, but I would recommend taking Remi to an avian vet to have him checked over if you haven't done so already - the vet would probably be able to answer your questions about any issues related to his status as a hybrid.
all the best to you and Remi - he sounds like an absolute sweetheart.

Don't worry, he will warm up soon enough. Looking forward to hearing more about him.
