Thanks @sat, but the upgrade path guarantees are strictly +1/-1 (in terms of version steps). All 6 of the above proposals seek to add unassigned nodes to a subnet that is 2 replica versions above the version currently deployed on the unassigned nodes, which is outside of the support guarantees that replica versions are developed to adhere to.
Specificially, Release: 94fd38099f0e63950eb5d5673b7b9d23780ace2d - ICP Dashboard (internetcomputer.org) is being skipped, and as far as I understand, it shouldn’t be.