I don’t see why they convert 767s into long range bombers capable of dropping large bunker busting bombs. The 767 refueling aircraft could refuel F-15s to provide escort all the way to Iran.
Where are the hard points for attaching bombs to the wings? The 767 wing unlike the A330/A340 wing was not designed for 4 engines. The A330 MRTT uses the place where the A340 engine #1 and #4 pylons would be attached as the point where refueling drogue pods are attached.
The 767 cargo bay would have to be redesigned with a pressure bulkhead like the P-8 (737-ERX) for an internal bomb bay. I bet that would be both expensive and difficult to retrofit into an already existing 767. It makes more sense to use their F-15's and F-16's and use the 767 tanker to extend their range.
Shhhsh!