The Linux Ship of Theseus
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pick any distro and install it.
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Then, without installing another distro over the top of it, slowly convert it into another distro by replacing package managers, installed packages, and configurations.
System must be usable and fully native to the new distro (all old packages replaced with new ones).
No flatpaks, avoid snaps where physically possible, native packages only.
Easy: pick two similar distros, such as Ubuntu and Debian or Manjaro and Arch and go from the base to the derivative.
Medium: Same as easy but go from the derivative to the base.
Hard: Pick two disparate distros like Debian and Artix and go from one to the other.
Nightmare: Make a self-compiled distro your target.
Shouldn’t everyone that installed Arch the right way be able to do it on most distros, simply after installing Pacman?
Though I think changing (shrink, create new, migrate, delete old) the partition layout would count as installing another distro on top…
Want a challange? Start with something like Silverblue.
Arch already has apt in the repo, so I’d imagine it’s not super hard to build your own Debian from there.