Wow! Decidedly old school tools!
Not aware of anyone who sharpens bonsai tools in the US as a regular business. Most any reputable tool sharpening service or bonsai professional can do this job well. Just tell them to keep the same angle… which they should do anyways. There is a guy Bruce’s Sharpening service PA who’s been recommended on the FB group as being really good though..
Or call up a reputable bonsai shop and ask if they use a service or do it themselves…. They might sharpen these for a reasonable price.
Lots of bonsai folks simply get some stones and sharpen their own tools. Not that hard.
Good Luck
DSD sends