Lin-Speed is extremely forgiving finish. You have a number of options for the quick and dirty job it sounds like you are seeking.

Get a little oil paint and mix it in the lin-speed until you get a very lightly tinted oil that will slowly build in color with repeated coats. If you are not very good with color find a woman who is... get her to tell you what colors you need to add to your mix.

If you do it that way let the coats dry a bit longer than normal. This method will yield far more depth to your finish than any other.

Another option is to use any oil-based stain that you find that is close. You can adjust these by mixing colors (within the same brand) or adding the oil colors. Do not use old stains or oil finishes that you have hanging around... start with fresh finish, always!

Another option that I use for small spot repairs is to fill with super-glue, level and then paint with oils, cover when dry with a few light coats of oil.
art

Reread your post after typing the answer and realize I didn't understand you exactly the first time I read it, but believe I got most of your questions and covered most of what I wanted to add?

Mark Begich, Joaquin Jackson, and Heller resistance... Three huge reasons to worry about the NRA.