revenge240

Hi all, hope everyone had a good new year! This question might've been covered but not sure if anyone has a solution of some sort.
The inlet nipple on my heater core (the nipple with the blend door valve) busted a while back when reattaching the heater hose to it. It's not completely broken, as you'll see in the pic below. My only options are:
1. Buy a used heater core, and hope the plastic nipples don't shatter when installing.(new heater cores are long discontinued for the 91 240)
2. Find some kind of twist in nipple that won't destroy the remaining plastic nipple.
3. Just go without heat (but I'd rather not).

Buying a used heater core may be a good option, but I'm worried about the plastic breaking once I try to clamp a hose onto it.
Alternatively, is there some kind of "twist-in" aluminum nipple that can bite into plastic without leaking or destroying it?
Appreciate any help in advance!

Pics below show broken inlet nipple and length that broke off.