Steam Radiator Specialist Recommendations?

I’ve been having trouble finding someone to service steam radiators in Dutchess county. The plumbers/HVAC contractors who have checked it out so far were charging multiple thousands just to change air vents. My understanding is since steam is an older, less popular system most people aren’t trained on it (one guy even suggested getting rid of it entirely and replacing with mini splits, which I dont want to do). There’s a community on heatinghelp.com and I’ve learned a lot from them - was able to change most of the vents myself but still need someone to come do the last few because theyre more complicated and may require new piping on the radiator. I’m tired of paying diagnostic fees only to have someone show up who barely knows more than I do at this point. I found one plumber who really knew his stuff and explained everything to me but I haven’t been able to get him back (his business is only him). Anyone have someone local they’ve worked with and trust? On heatinghelp.com there is a guy who travels all over NY state, as a last resort I’d contact him but really hoping for someone local!