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Something similar to WinCompose?
(lemmy.dbzer0.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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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