Hi Randy what you want to do is ILLEGAL in most plumbing codes.
Lets think about this.
Suppose you have a tub full of soapy dirty water with this hose hanging down and for some reason you get a loss in pressure like a water main break.
What we now have is a classic example of back flow TSK,TSK,TSK what to do?
Now lets try to do it legally and use the existing shower arm (1/2″ threads) and get a chrome plated diverter with a shower hose just long enough to be about 4″ above the tubs flood level rim NOT over flow BUT flood level.
Now we have the following LEGAL connections
1- you have the bath tub spout
2- You can use the existing shower head
3- You have the option to use the hand held so you do not have to wet your hair when showering and this is a permanent hook up.
Now isnt this a great idea to have legal options and not using a quick disconnect all the time?
Good thing I went to school that day huh?
Get a decent quality stainless steel hose not the cheap imported stuff.