New teams join a league in future

[Toronto Blizzard]

Hello,

I want to create a structure where five years down the road (2026 as I'm playing FM22) four new teams join the second (lowest) division.  What's the best way to do this?  Could I create a version of the second division for that year that has 'get all teams from division' and then the four specific teams?

Another option I guess would be to create a "league" with those four teams and then just for 2025 four teams are promoted from that league and none are relegated to it?  Can I create a hidden competition, or only a hidden stage?

Many thanks!