Cool, have fun.
Indeed.
Meanwhile, based on a comment I made inspired by reading about Dark Sun's character tree concept, it seems I might be running my IRL D&D group's next 5e campaign.
The basic idea is that the PCs are part of an organization, like an adventuring guild or something, with a lot of members, which they regularly send out on different missions with different team compositions. This means that players can switch out whichever characters they want at the start of a new adventure without us having to spend a lot of time figuring out why one character is suddenly leaving while a new one takes their place, which is good, since people my group like to play a lot of different characters. It's also assumed that the characters not being played are busy with some other missions or tasks, to explain why we can't just bring everybody with us, and, if someone dies or whatever, we can have a replacement come by and not need to explain why we suddenly trust this new person who happened upon our group.
In addition to the character stuff, I'm thinking I might implement a magic item lending library, or whatever you might call it, where they contribute magic items to the guild pool, and thereby gain credit to be able to take out different magic items (since the NPC adventurers would find them too). This way, I can introduce a greater variety of magic items into the game without the players themselves having boatloads of the stuff to use at any time; they just get a certain loadout for the mission at hand, which can be switched up when they return to HQ.
Similarly, they'll gain access to things like airships and flying mounts, and their contact with foreign and exotic cultures and races will give them access to new kinds of mercenaries and spellcasters and other skilled NPCs, and possibly this might become a system to unlock new player races. Also, the NPC adventurers will bring back rumors and plot tokens tomes for studying, which will lead to more adventures.
To run things behind the scenes, I'd like to use something like
Stars Without Number's faction system, reskinned for use in a fantasy setting. I haven't looked through it thoroughly, but
this hack might do the trick.