yes you can, but it is sooooo cheap you would be better off with buying a crap load of it at once and keeping it in your fridge.
Yeast washing can be done with out any problems, but remember. The more you transfer yeast and add things to yeast the greater the opportunity to get an infection.
I harvested some pacman and made a starter, it was infected and I didn't know it until I dumped a DFH60 and a chocolate stout I split the starter between.
That didn't have to happen, but it did and it wouldn't have if I just would have used a clean finishing yeast. That's all pacman is, a clean finishing yeast. I bough into the hype, i could have used safale-05 and been just as good. Plus I would have 10 more gallons of beer right now.