A piece of pipe threaded male one end to go into the head, and threaded female the other, to insert the PT deco valve?
Maybe scavenge the stem from a stuffed PT deco valve and tap the upper end to insert the good one into?
Carefully open up and gut a good PT valve to repair a blown FC valve that is rebuildable, unlike the sealed for life PT variety? There is always a way, but worth the trouble is the question.
