yes, you can use your USA scorebook in a DVG trial . . .
per the DVG America web site:
B2. Which scorebooks are acceptable in a DVG trial?
Any scorebook from a recognized organization. In LV America, that includes scorebooks from USA, any AWDF member organization, ATTIBOX member clubs, and the GSDCA-WDA. If you import a dog and it comes with, for example, an ADRK scorebook, unless you are a member of ADRK, that scorebook is invalid with which to enter a trial. You must send a copy of the scorebook to the DVG office with a scorebook application and receive back a DVG scorebook, which will state that whatever titles the dog holds are on record in the office. As a DVG member, you have to have a DVG scorebook, anyway.
not sure if they're gonna offer the SCH A at the DC club trial or not, but it's worth asking them. it's possible that they will if they know someone is interested in it.
the blind running for the beginning stages of SCH shouldn't be too difficult for you to teach--generally, you teach the dog to go "revier" and point to the dummy blind, then you call the dog to come back to you, and as he approaches, you point him to "revier" in the live blind, where he'll find the decoy. then he has to bark and hold the decoy there till you arrive. ideally, he shouldn't be dirty in the blind (harrassing or "molesting" the decoy) cuz that'll lose you points. not sure if PSA trains to bite a suit or sleeve, but it's probably good for you to know that if he actually bites anywhere but the sleeve, they'll disqualify . . . once in the blind, the dog barks and holds for about 30 seconds, then you approach and call the dog into heel, allow the helper do exit the blind unmolested by the dog, and then there's a scenario in which the decoy attempts to "escape," and the dog has to stop him independently (no commands, i'm pretty sure, the dog is supposed to know what to do here) in 20 paces or less.
i think that's it for blind work on the SCH I . . . the rest is out on the field.