It's your piano and your decision, even though I am not sure why you are the one to decide that hammers a) have reached their EOL, b) new hammers need major regulation and c) why b) is a bad thing.
In my experience, real regulation is something you don't encounter on a brand new piano, no matter the price tag - and it's totally worth the effort to get it done by a master. We're talking about a full day of regulation here, not the quick one hour variant of getting it somewhat right.
Protek in itself isn't evil and even if applied too abundantly in whatever part of the action: It doesn't do irreversible harm to any part of it. Worst case scenario is to replace all bushings of keys and worstworst case scenario to replace all bushings in the wippens.
Other than that, Protek doesn't really do any long term damage. We're talking CLP, right?
In any case, replacing the full action of a piano is more than just pulling out the old one and pushing in the new one. I can guarantee you that keybed and keyframe will never be a perfect match in this scenario. Which also means that you can add another couple of thousands of USD for work done in a workshop to get the right fit.
From my experience there are very, very few instances where a full action replacement is warranted (let's exclude "rebuilds" of really old instruments). Rebuilding an action according to factory standards isn't rocket science; it's replacement of a few crucial parts where true restoration doesn't make sense - and a lot of regulation.
My own 1973 Bösendorfer 225:
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Has been in Bösendorfer maintenance at the Austrian state broadcast station for the past decades. Maintenance work was done, but no major work was necessary. My technician estimates that it's at about 40% of its actual potential and we'll slowly work our way to getting it into ship shape. But even right now I've heard worse ones.
I really question your approach, but I don't judge it.
A 1999 Bösendorfer 225 doesn't need a new action (unless it is heavily damaged by falling off a truck twice) and above all it does not need a re-calculation of its action geometry. Your whole story sounds like 'Grand Obsession' all over with technicians who think they know better than those who actually designed and built the piano.
Sorry, but I am really passionate about these things, so please don't get this down the wrong throat.