The ISS model specifically says it's for adults, 16+, so playability isn't a huge deal.
Additionally IMO they're missing the boat by sticking to their classic distribution model that has the restraints you say. I mean sure, some sets aren't fit for shelf space in a Target toy aisle, but they should be able to JIT packaging for just about any set that's had the work put in as long as they don't run afoul of trademark.