I doubt that it would be perked, down low it has no special characteristics and at the high altitude it takes to be able to outrun anything it will still be slower than most planes you will find at those altitudes.
K4s, 190D, P51, Typh/Temp, Spit14, Spit16, P47N and M, Yak9U, Ta152, the F4U1a and the F4U4 all have a speed advantage over the mossie at altitude, these are also some of the most common planes in LW.
I imagine it will still have a very strong following, but will probably have an ENY of 10-15.
Also keep in mind that at the 20k+ altitude it is difficult to bomb, a change of 1 foot from calibrated altitude could make you miss the target completely, i believe this could factor in to any perk pricing.
edit: Please give us the tse-tse too.
Sincerely,
Tupac