Granted the USAAC was generally adverse to using A/C designed in other countries. The Not Invented Here Syndrome. Would it of been possibe for the US to have adapted the Mosquito perhaps constructed out of aluminum.
They used Mossies quite extensively, but establishing an American production source would have taken too long, and all-metal construction would be a complete redesign, taking much longer. The Pratt and Whitney R-2800 engine, like the Merlin, made great airplanes out of good airplanes. The Black Widow, in the end, was judged comparable in performance.
Hap Arnold seriously considered reequipping the first two P-61 units with Mosquitoes, until there was a flyoff in England. The P-61 won, and that was that. The only backup was a never-built A-26 variant that Douglas had waiting in the wings, but no order was placed.
The USAAF was happy to use British aircraft in niche roles during the war, they PR Spitfire and Mosquito saw US service in quite reasonable numbers. But in the main the US a good range of aircraft to do almost any job required. Night fighting wasnt really a major US requirement that would have needed such a drastic effort as making the Mossie in the US.
Douglas had an A-26 variant with the radar in the nose instead of those eight .50s, and four 20-mm in the bomb bay as a P-61 alternative. Paper design only, and not pursued when the decision to fully go ahead with the P-61 was made.
In any case, there were already P-61s in the Pacific, and Black Widows would still have been seeing combat.
The US used Spitfires, Beaufighters, and Mosquitos as stopgaps and for special purposes. I believe the main reason so few allied types were used by the USAAF was that the USA simply had the design and production capacity to produce more than enough of their own designs - and to be honest - US designs were at least equivalent in capability to what the British could offer. The Mosquito was a somewhat different proposition, and I seem to remember reading that at one time there was serious consideration given to license production of the type in the US for the USAAF.
And postwar there was the Canberra and Harrier - both of which saw considerable US service.
It wasn't just photo Spitfires: four AAF Fighter Groups (4th, descended from the RAF's Eagle Squadrons; and 31st in the Med, plus two more) used fighter Spitfires.