Table Picker / Flag Field Custom Development Offer

Hi, @jrockowitz I'd like to sponsor development of a feature of what I think would best be described as a table picker.

Or a booth picker. Or a seat picker. Or ... flag?

Basically, I need to create a kind of multiselect field that will allow users to pick one (or up to an optional number) of tables/seats/booths in a room, then disallow other users from selecting those same tables. Very much like global flags in the flag module.

It's for a conference exhibitor registration site.

To make it crazier, my use case will require me to allow users to "swap tables" at a later time - that is, if there is an open (unflagged) table out there at some future point in time, they can "unflag" one of their their existing selections, thus freeing them to select an open one. So I would want to basically be able to restrict the quantity of items that can be picked per form entry.

Crazy, right? I've been thinking about just going for it and using flag for this, but I think the D8 Webform world is so awesome, I wanted to throw it out there. If this is a whacked idea, I'm ok with rejection. But I'd like to pay to develop this feature for the rest of the world to be able to use.