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Something similar to WinCompose?
(lemmy.dbzer0.com)
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On KDE I found a keyboard called something like "US English international with AltGr deadkeys" which does what you describe
Dead keys are another method of doing diacritics but what OP is describing is the compose key, which is independent of layout and can do more symbols not just diacritics.
I'm unfamiliar with the difference in nomenclature, but the UX OP is describing is pretty much the same as what I've used. Eg. R-Alt + " + i = ï