Jet2 could get all the type rated FOs they need from the KLS pool. I've been operating with several of them recently and am very impressed. A much better product than EMT turn out for RYR.
Captains are a different story. The only way to attract them is with much more money. The current market rate for experienced Captains is massively more than Jet2 pays.
I do miss Jet2 and especially the Blackpool base, but since I left in 2009, I have been to a lot of great places and made a lot of new friends and a whole lot more money. It is a stable place to work, but no one there will be as rich as an airline pilot should be.
Btw, on the rare occasion I wear a hivis, I still use that same one. Cheers.