The Knights Hospitaller 'accidentally' became a major European air power (2019)
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I can't help imagining the US and Poland employing a similar trick now for providing MiGs to Ukraine.
The added complication seems to be the issue of where the MiGs take off from, and I don't think the SMOM are in possession of any airfields, but the Polish pilots could land them (unarmed) at a Swedish civilian airport, where the Polish ambassador could be waiting to sign some paperwork with a representative of the SMOM, who would then sell the jets for a nominal fee to the Ukrainian ambassador. Then some Ukrainian pilots could get in and fly them back to Ukraine.
Sweden doesn't even want to consider joining NATO at the moment, do you think they would be up for such a diplomatic sleight of hand?
In any case, there are plenty of non-NATO countries that might be willing to facilitate the exchange, depending on how far the range of a MiG is, and where it can refuel.
Plus, no one actually wants to send the planes, the whole dance was over who was going to take the diplomatic hit over saying no to Ukraine.
There are, unfortunately, two possible extremes when faced with a nuclear armed tyrant: Firstly, you could decide that they are not crazy enough to destroy the world, so they wouldn't launch nukes just because you implemented a no fly zone in a territory where they are operating (i.e. you shot down their aircraft).
The other extreme is that you tread on eggshells, trying not to do anything that might trigger a response, so as not to "escalate" things. That's arguably the approach Germany took when it only offered helmets to Ukraine, which obviously failed to prevent an escalation. Now Germany is sending weapons to Ukraine, and doesn't seem to have suffered any unbearable consequences, although maybe Sweden would do, as it doesn't have the protection that Article 5 offers.