No it isn't. The EU will make a show of telling off the UK, realize that 17% of Europe's economy walking out the door is a bad thing and then invite them to take a deal similar to Norway's. The UK will then gladly accept that deal.
The bigger question is why do military pilots have to do any of this nonsense? All of this was covered in UPT and annually on Instrument Checkrides. What purpose does making a dude learn a light twin for one flight serve?