Have you tried a compose key? Double-acute ő for me is right alt, =, o without any layout changes. Many other symbols are already defined too, like € (right alt, e, =), ł (right alt, /, l), or ß (right alt, s, s). The custom layout might be faster if you're typing a lot of text though.
I've not tried the XCompose option, other solution I've tried was to also use the US international keyboard layout, with that you can do ó by pressing the "" and then "o", but that was quite slow, also was trouble some as when I wanted to actually write "", then had to press it twice.
" and then "o", but that was quite slow, also was trouble some as when I wanted to actually write "
XCompose does sounds like a good solution maybe I'll try it on my next install :)
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