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That looks like a fun mod. I definitely have neither the tools nor the stones to help though. My guess is that any watch repairer would want to service the inbound movement but wouldn't charge extra for swapping the movement over as they were doing the service. If you're using a new movement you might even want to do it yourself? A hand press is only £15, other than a clean workbench what else would you need?
@freddo or @Stonehedge would either of you be up from swapping a 6R15 or NE15 into a SKX013?
https://seikoparts.wordpress.com/2018/09/20/skx-supercharged-mod-with-6r15/
My watch's timekeeping isn't great, but in particular every now and then it seems to drop 5-10mins. I figured a movement swap wouldn't be much different in price to a service.