This too might also be a small helper, even if it doesn’t do exactly what you want atm: https://forum.renoise.com/t/tool-3-1-capture-track-from-instrument/34036 . It works the other way around to “auto-capture instrument”, i e goes to the first track where the instrument is found.
I’m a bit tempted to script what you’re suggesting. I don’t think that it’s possible to highlight the matrix blocks though (you don’t wanna change those colors permanently with a script), but maybe it’s sufficient if they flash three times for example? This tool could also have “goto previous/next occurance” shortcuts (if that’s not already native in Renoise). What do you think?