RJM
here is a link to a forum I'm on for G tube patients with a post by a patient who also cannot feed himself or hold his tube, the problem your patient faces. They devised a syringe holder that they used to hold their son's syringe while he was being fed. They cut the top off a table lamp and attached a metal ring to the top of the lamp . there are pictures / Hope this helps
BD forum- syringe holder Charm