I would probably just pitch it. I'm not an AG brewer but I assume you could just mash a little grain in a little water and pitch the yeast into the resulting wort if you need a starter. Or you could look at an ethnic food store for a drink called "Malta Goya" it's an unfermented malt beverage that supposedly can be used to make starters.
I don't remember where it came from so I can't credit the author (and can't attest to its accuracy), but I have a little table I printed off of some website that converts grain to extract. According to the table, 1 lb. of grain would yield the equivalent of to 0.6 lbs of DME. 1.5 lbs of grain would yield the equivalent of 0.9 lbs of DME.
I tryed a batch sparge with 2# pale malt and .66 gal water @ 153 let it rest for 60 min then drained and refilled with .66 gal @ 170 let rest for 15 min collected runnings and let cool. I was able to collect about 1/2 gal of unhoped wort.
I will post some pics of the small water cooler that I used as a mash tun.