I wrote in another thread about this yesterday. You don't just take planes. (Ones we don't even fly to boot)
You would need not only pilots familiar and trained on the weapons platform. Maybe we have a few at flight schools.

But the bigger issue is planes need entire support operations, maintenance, supply, special tools specific, as well as technicians able to work on the end item.

My unit went from A10s to F15s - it took months of training, preparation, retooling etc. You don't just say - here - take our Migs. This is a show of hand that the Polish do not intend to use their MANPOWER in this theater.