Is there a way to have roon link two or more tracks that are continuous on source material when (and this is key) playing a randomized track queue?
No, this is not an option. You may make a request in Feedback > Feature Suggestions.
What if you made it into a multi part composition grouping?
That’s a good idea! No idea if it would work with Radio or a randomized queue, but worth a try.
I’ve done this for a few rock albums.
For me, unfortunately my experience dictates that it does work. I have some playlists that I play on random that include whole musicals that are constructed as MPCs, and when I hit a musical, it plays the whole darn thing, and I find myself having to manually intervene!
Ah, you win some, you lose some. It’s one thing having a “20 minute” track, but playing the entire musical is not what you want.