NO FREAKIN' WAY.
Until I got my P3AT and actually fired it, I also thought that the gun would be even better in 9mmMak, but I cannot recommend such a gun in good conscience. In .32ACP, the Kel-Tecs are shootable enough that you're willing to put in range time with them, but I don't find that to be the case with the .380 gun.
I have to steel myself to practice with my P3AT as it is, it's right on the ragged edge of controllability for me - up-chambering it to 9mmMak would, IMHO, be not enough of a good thing to offset the added wear and tear on gun and shooter. Trying to play the "carry often, shoot seldom" game with guns this small/light, in these calibers, is a bad idea from the get-go - if you don't put in at least 100rds a month, every month, so that you can master the P3AT, you're a greater danger to innocent bystanders than you are to a prospective assailant.
The gun is just so light and has so little frame area to grip, that in .380ACP it will jump and twist itself right out of your fist unless you know how to employ it properly - if the gun were firing 9mmMak, the problem would be even worse. The ONLY way I've found to control the P3AT in rapid-fire is to shoot the gun ONE-handed - that way your gun-hand "rolls with the punch" and stays in the same place on the grip-frame. If I try to shoot the gun in Weaver or Isosceles, my hands are so stable that the gun squirts itself out of my grasp. I've also found that a Hogue or Pachmayr rubber grip-sleeve does wonders in keeping the P3AT anchored in my fist.