You cant transfer perks. You must fly a fighter to get fighter perks. You can earn perks in any fighter, but planes with low ENY (for example all perked fighters, but also La7 and such) will let you gain perk points VERY slow.
The people you see almost exclusively use perk planes have just accumulated enough perk points in the past to be able to spend a bit. Also they tend to loose their planes less often. And it takes not many sorties in a high ENY plane to get enough perks for a tempest. A good sortie in a C205 can give you 30 perks quite easily, and sometimes much more.