Slink, you could easily still buy the 25 then turn around and sell the extra as soon as they arrive. If you advertise before they arrive, you might even have folks lined up, tis the season when everyone is starting to get chicks. I don't know if Sandhill sexes their chicks, if so, they would be even easier to sell but given the recent press the Orloff has gotten, you could probably find a straight run buyer or two.
Another option is to run a CraigsList ad to see if anyone else is in the same situation. That's how I got my first birds, teamed up with someone via CL who wanted to place a hatchery order to get breeds our local feed stores didn't carry, but only wanted half the chicks. At the time, I thought wow, 12, I think I could handle that many... Hahaha, at any given time I'm pushing 100 around here, right now I "only" have 54 and the yard look bare!