velocity server management - players moving between servers

I have players joining the survival server. Don't want lobby. Survival is the most used. At spawn I have set up portals that will move the player to the corresponding server of the portal they enter.

I note when they return it places them back in the portal. No biggie...

Thinking if the portal was a jump into rather than a step into. The drop area would capture them and move server. When they return they would falll further to a command block tp catchment that would tp them to spawn area...? Could throw them up with feather falling...

How do you manage the server cross change? I have kids online so making it easier (and more fun) than writing /server abc. What other ideas do you have? Thanks!