You could try your local Cat dealer or a private mobile mechanic with the tools to do it. I can tell you by the time you pay someone to do it you can buy the hollow ram cylinder and pump and do it yourself. Theres nothing special about the adapters and can be made easily. Make sure to use grade 8 fasteners for the pullers.
Theres a lot of bushcraft methods to do it that someone else might suggest but I don't care to promote those.
You might try Erik Christenbury - he might know of someone that has one. But I'm with Scott - if you get a cheap hollow ram, you can do both the pulling and pushing with it and a couple of homemade adapters. I did my sprockets and steering clutches with mine - very convenient
"i reject your reality and substitute my own" - adam savage. i suspect my final words maybe "well shit, that didnt work"
instead of perfection some times we just have to accept practicality