Would be amazing if all required block/item/etc. asset files (and also custom sprites from image files in the case of #44 being implemented) could be registered via Advanced Runtime Resource Pack.

Could you join the Discord to discuss your suggestions further? All three of the issues you opened seem like something potentially worthy of being implemented, but I feel like some longer discussions about how to specially approach them might be in order.
Cheers

As discussed on Discord, this is best left to an addon mod and not going to be implemented in owo itself - thus I'm closing this issue
Cheers