Ok, ok, touched a sensitive issue then
Ok we may not know each other and as I said you could buy your own.
Then add the cost to develop, test, validate it to the rest of the program, and you'll be back with the usual cost issue.
Nothing is difficult, if you've got money to do it.
Ask BAe to build an F-35 equivalent and they will. But it may be a bit more difficult to afford, compare to having a small percentage of the USAF Air Power and getting the numbers effect.
Happy if you want to end this discussion, but still think it's worth a talk.
Bye bye