As you know BNW is baked into Brave New Oarc - and I am working with Oarcinae to port Brave New Oarc to 2.0. I do notice there are many more API's that could implement some of the inventory limitations that BNW does. I doubt it will do as nice a job of loading the hand with the inventory item selected, or spilling items on the ground, which I think needs to remain within BNW.
One thing I was thinking could be done is to automatically convert the player from God mode to Character mode for the trip to another planet, and then back when they feel they would like to. The problem with this is the events for entering and exiting the silo seem to be missing in the api.
Another option is a new building/portal that they step into to convert from God to Character, whenever they like. Or offer a device they teleport to the planet, that when used converts them.
They would need some form of BNW Deployment Pack, to setup the starting area with bots, roboport, power and that power type may be different on each planet, although solar seems safe on all. OR they could just load all that they need into the capsule and deliver it to the planet. Their character would lay a Main Roboport that could not be picked up, and if destroyed would remove them from that planet and placed back into the platform. They would need to return to Nauvis to make another main roboport, bots, ... Some of the enemies on say Vulcanus are very difficult to kill and may require driving vehicles remotely and firing weapons, which is not in 1.1 BNW, although should be supported in the more remote api of 2.0.
I will be very interested in whatever you change in current BNW and hope you'll post detailed information on changes. I may be able to help as well.