Servicing your watch other than auth. agents?

[MrBezel]

I know this was discussed many times. Trying to find someone who would service my Vulcain cricket GMT (w alarm) apart from going back to the authorised agent. Folks like JW Watch and Passions said they don't do walk-ins anymore (I guess they might accept if you're a long time customer). Any recommendations would be appreciated.
Cheers.