I'm not sure where you got your information about the Omegas, but maybe 8 years or so ago, I tried to get my old late 60's vintage Omega repaired at a big authorized dealer and they told me that Swatch Group, who owns Omega and a number other old brands, was no longer supporting the old classic watches. Once their supply of parts they inherited ran out, tough titties.
If anything I have heard the exact opposite, specifically that Rolex has been known to turn away vintage watch owners due to lack of parts wheras Omega has fixed just about everything, and in rare cases will even make parts for high demand vintage watches, remember they did a recent run of bezels for older Seamaster 300s.
Not to mention there should be enough parts out there for the Speedy pro to last forever given how long the model has been in production and how little it has changed.