I have one of these Kline switchers (MP15AC). It is a pretty good runner in conventional. I thought about converting it with ERR parts but then I thought about it again. It will cost about $200 for parts and, at the end of the day, I’m not sure that it would perform at the level of other, as built, PS2/PS3 or TMCC locos. Also, if you compare your locomotive to prototype pictures you will see it is seriously lacking in details, particularly the pilot and end walkways.
In my opinion, you would be better off saving your money and search local shows or the bay for a used PS2/PS3 loco. Just my opinion.