[John Bartley]

All I would need the frequency counter for would be to dial in the IF frequency or the Dial Alignment stations, which I would just boost the RF output just enough for that and then just disconnect it when its not needed,

To do what you describe above, you don't really need a counter or any modifications. I am not advising against it. In fact, if you'll enjoy doing the mod's, then go for it, but .... more economically, to get your sig-gen frequency set all you need is a newer, digital radio to listen to the sig-gen. That will be as accurate as you'll need, given that your sig-gen will drift a little bit all the time that you are using it. For basic AM/SW radios it will be fine and even a little bit of drift will not materially affect your alignment work.