Sending Grimm out for training?

For anyone following Grimm's story, here's a synopsis:

Grimm is 13 months, and has a foundation of sit-wait-give-focus at doorways before being released to come through, same sit-wait-focus required before he is released for his food, water, to get a toy, treat, etc. He knows sit, down, come, stay, heel, take it, gentle, bring it, out, go potty, go in crate, and jump up on/in. He is not tight and perfect with all, but pretty good for a 13 month old being trained by a novice. He has learned to ride a city bus, walk on a busy sidewalk, ride an elevator, walk over bridges, accept babystrollers passing him, heavy bicycle traffic, road traffic, and is EXTREMELY FRIENDLY with people of all ages and types.

I am looking for a trainer to supervise doggy socialization for Grimm, so he can learn dogs aren't space aliens to woof-and-lunge at, and so he can learn correct doggy behavior in this dog-crowded city with so many off-lead dogs. Second, the trainer must then teach Grimm to work around/ignore other dogs. I don't have the handstrength, due to disability to give a correction Grimm responds to in such a moment of titilating distraction-- someone else MUST do this. And, he can pull me off my feet in a doggy meet-up, so, I do need someone else to handle Grimm during.

My two training choices seem to be: 1) a man who breeds Labs for guide dog work (ideal type of friendly, calm dogs for Grimm to meet for socialization), who only has in-house training where the dog lives there, gets worked with 3 times a day, and does get to work around other dogs, or 2)trying to find someone at a Schutzhund club willing to work with a non-Schutzhund dog on a non-Schutzhund issue...... the benefit would be, ideally, NOT sending Grimm away, the drawback is communicating to Schutzhund folks that Grimm needs to meet CALM dogs in CALM situations in CALM settings.. not having them bring their wildly anticipatory, excited sport dogs to the club grounds that the dogs expect to do thrilling bitework on, setting a tone of charged energy that Grimm does NOT need to be exposed to in his socialization. Yup, many folks doing sport have stable, lovely, calm dogs-- but meeting on the grounds of the club, where these dogs expect thrills, can send energy to Grimm that may not at all be a calm vibe.

The send-away trainer is well-known, but for Labs and guide dog work... not for being familiar with Grimm's Czech lines GSD type of dog. (eerily, they keep harping on the neutering theme... without knowing my dog at all, without hearing our needs, etc-- methinks they get hefty kickback from vets as they work with assistance dogs who need to be neutered to get freebies here) Grimm would be trained off-lead and socialized around other dogs.

If (that is a HUGE 'if') I find a Schutzhund person, and they can help Grimm overcome his nerdy barking/lunging at seeing another dog, then I could myself be in a club training him and improving his training.

One other weird thing here: In Germany, nobody dares to seriously question anyone with a piece of paper saying they're an expert. I can imagine with all the questions I have for the send-away trainer, including that I would want to meet him alone withOUT Grimm for the first meeting, to evaluate HIM, would not make me especially popular here.

I sure could use the training the send-away guy offers-- it would solve the remaining issues that are making life either difficult or dangerous here for us on walks. I am just very, very cautious in sending my Grimm anywehere, to anyone, who may not take the care of him that I would wish. I normally do NOT ever believe in send-away training!! My trainer options here are extremely limited, though.