Have you now morphed from the guy that asks questions about why you've had yet another catastrophic failure to the guy that now suggests having a fish wrap around your arm and another subsequently bite it is normal behavior?
It is not, and you may be less of a fish whisperer than you have assumed. Fondling your fish is not normal and there are science based reasons for you to avoid doing so. That such an action in your tank might also trigger related unwanted aggression or other behaviors doesn't change the fundamental issue which is that you should not be handling your fish unnecessarily or with any regularity. Though you may be able to condition a fish to exhibit this and other similarly unusual feeding behaviors that does not mean it's in the fish's best interest nor does it mean it's even ok.
In my mind it's more gentle on a fish to transfer it from one tank to another by hand rather than by net if the fish will allow it. Under certain circumstances you may need to touch your fish to examine or disentangle it from something but conditioning your fish to think that feeding time is synonymous with having its slime coat removed is a precursor to yet another ultimate failure.
You are responsible for the life of a rare and unusual animal that will be on life support 24/7/365 for the balance of its life. Assuming that you may also introduce unnatural and wholly unnecessary contact between that fish and anything else is unwise. Learn first to be a good steward of the life you've chosen to become responsible for before you also decide which unnatural events must also be acceptable to your fish.
Fondle your dog if you must.
Never fondle your fish.