There are keyboard shortcuts for diacritics.. ñ, é, å, ç, à, ö...
I'd suggest you merely learn the shortcuts for these.
It's not really an InDesign thing. It's generally built into the OS keyboard structure.
For Windows, you can check this list: https://support.microsoft.com/en-us/office/keyboard-shortcuts-to-add-language-accent-marks-in-word-3801b103-6a8d-42a5-b8ba-fdc3774cfc76
For the Mac: https://www.reed.edu/cis/help/diacritics.html#:~:text=To%20type%20diacritics%20in%20a,%2B%20c%20(or%20C).
(In case of link rot, merely do an internet search for "how to input diacritics". Many relevant links will be presented.)
Above being posted...
If you really want to use the Glyphs panel in InDesign you can choose the
Show Options item from the Glyph Panel Menu...
The Glyph Panel will then show
Recently Used glyphs. So, you don't have to repeatedly find the same glyph if you are using it often.