Guarantee a Main Entrance and a Boss Room in a dungeon

I am working on custom dungeon generation for a datapack, and after learning how jigsaws work, it seems you can only guarantee one room in the dungeon, which is the anchor room. However, I want to guarantee multiple rooms (Ex: An entrance, and a boss room(.
I have a few ideas, but I want to know if there's a potentially better way of doing this. Here's my idea:

Make a dungeon w/ jigsaws like normal

However, make special "main path" rooms that are identical to the other rooms but point to the next "depth" pool of main rooms

Make identical copies of each "main path" room except their jigsaw exits into the next "depth" pool

each "depth" pool is the same as the previous depth, except it just contains a pool of "main path" rooms that are from the next depth pool

The last depth that I have set will contain armor stands. Then, the datapack randomly picks one of the armor stands to use /place to spawn the boss room. The rotation depending on which direction the armor stand is facing.


How does my idea sound? Again, if there is a better way, i'd love to hear it. If not, then how can I improve on the idea I have currently?