I agree that the best course of action to try Haiku is to get a suitable used machine, ideally with reference to their hardware compatibility guide.
As for me, I still have a 12" MacBook from 2016 which works still. Whilst not a state of affairs that will last forever, I will keep it whilst it runs the current MacOS. It is getting increasingly inadequate in the face of MacOS bloat, and when it stops getting updates, Haiku is on the shortlist.
Hope springs eternal! It’s great to hear you have had a go at it already, I await reports of further installation attempts with bated breath…
Incidentally, from the Wikipedia page:
The modular design[16] of BeOS allowed individual components of Haiku to initially be developed in teams in relative isolation, in many cases developing them as replacements for the BeOS components prior to the completion of other parts of the operating system.
In other words, the design philosophy employed by BeOS (and subsequently Haiku) mirrors in software that of the Framework hardware itself. A match made in heaven, you might think.