See. I did that in reverse. I went from a collection of cobbled-together frankenbikes and 175 lbs to a bunch of decent-to-nice bike and 250.
No reason you couldn't have that KHS for decades ... I am about to head out on my '84 Raleigh----50-34x12-28 Tiagra 10-speed and 23-mm tires until they wear out, when I will probably go up to 28s.