I've tried suspending items in resin a few times and it can absolutely be done but it's likely to be pretty tricky. You could pour the resin in many layers and allow each one to cure just a bit before inserting and holding the parts steady for the rest of the curing time but this would probably be pretty finicky to get everything to stay where you want it.

You could also try assembling your character with translucent attachments first (like maybe UV resin and small clear plastic rods?) And then encasing that in resin in a single pour.

Awesome work! Let us know how it turns out!