Yes. Just the ends! That's how the magic happens. The green paint colors the light, which lights up the dial scale (and any other markings) green, but not the glass.
Also, no need to remove the dial glass on the STR-7065 (and 7055, etc.) If you remove the face plate and the dial lamps you'll have easy access without removing the glass. Just stand the receiver on its side to apply the paint, and wait for it to dry before moving it again.
I'm sure other brands of glass paint will work, as long as the color is right. This just happens to be the one I found and it works well. I think the frosted color probably diffuses the light a little better than gloss would. No need to go to Blick for it, unless it's really convenient. I've seen it sold by several vendors online (even someone on etsy) at reasonable prices. (Art stores are often pretty pricey.)
I'm not in Michigan (sorry.) As for how many coats, that really depends on how thickly you put each coat on. You want to achieve a good solid coating of green without making it so thick the light is obscured too much.