at the LBS the new bike carton often includes a wee brush in the cap bottle of touch-up paint, it rarely goes out the door with the new bike
[the price tag bag is too small , and too much stuff to hang off the bars for test rides], .... so
there is a bin/box in the bike shop where they are collecting ..
PDX and its 500+ bike-shops , you should find some, somewhere in town .. perhaps a match or close to the color.
The frame is not noticeably rusted inside. Should I apply Framesaver? Spray WD40 inside? Or just let it be?
you planning to strip it down to the bare frame ? that is pretty much required for framesaver jobs
to be thorough enough , with the sloshing it all around, inside the tubes, you would need to do , for total coverage..