How to set up a survival server with a creative world?

Hi all,
I am setting up a new server, and this is what I want.

Player joins server into the default world.
Player uses "command A" to enter the creative world.
Player uses "command B" to return to their last position in the default world.
Player makes a nether portal and goes to the nether.
Player uses "command A" to enter the creative world.
Player uses "command B" to return to their last position in the nether.

Also, if a player logs out while in any of the 4 worlds, (overworld, nether, end, creative), they will login in the same position that they logged out.

What combination of plugins can achieve this?