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I use capslock.

There are a number of popular choices that come preconfigured, see file /usr/share/X11/xkb/rules/base.lst line 851

https://github.com/freedesktop/xkeyboard-config/blob/master/...

cool thanks

In my case (AltGr similarly reserved for (mostly) Polish specific letters), I set it to the right Ctrl key, though keys like CapsLock and Menu are also good candidates.

As documented in the linked README, they use right-alt as compose, but that can be changed in the settings.

That's the readme for WinCompose. I'm wondering about linux

In the case of Ubuntu system with Gnome/Xfce4/KDE/LXDE: https://help.ubuntu.com/community/ComposeKey

As for other distributions, unfortunately I have no idea, but I would hazard a guess the right settings (if present) should be in similar places relating to keyboard setup.

Shift+AltGr, i.e. ralt_switch_multikey

Maybe the menu key, if you have it