I made this repair by cutting out the tee... costed $7.00 and about 1 1/2 hrs labor.
Disconnected the clamp going into the heater core (firewall) and then the clamp at near the radiator, then cut the hose flush at the bottom of the tee. Took the hose with the tee attached on the work bench and cut the swagged tee apart to remove the to remaining hoses. Picked up a 3/4' plastiic ribbed high temp tee from Advance and a few stainless hose clamps and reinstalled. It was tedious but no big deal. To prevent the coolant from flowing from where i pulled the hoses from i attached a short piece of 3/4 hose and extended up above the radiator, the hose going to the rear heater i plugged with a piece of paper towel. All good. Took about an hour and half.
I do alot of this, repair instead of replace, and have to start taking pics and posting them. I just never think about it at the time.