Repairs for a Seiko 6139-0030 (and other Seiko Chronos)

I have found to my frustration (re Seiko chronos) that there appears to be 2 kinds of watch repairers: those who (for various reasons) will not touch them - and those who will charge a fortune to repair/service* them. (*The latter are the UK based watch smiths I have contacted.)

For this reason, I have at least 3 Seiko chronos (6138 and 6139) sitting in boxes needing rescuing..

Is there a really reliable and trustworthy Singapore based watch repairer that actually (ideally) specialises in Seiko, is able to fix chronos - AND will not charge an arm and a leg for doing so?

Any suggestions would be warmly and gratefully welcomed.