There are sometimes a subset of weapons (and other items) that are in Battle Royale but not available in UEFN.
From the current Simpsons mini-season, Mr Blasty is an example.
I suspect this is because “Mr Blasty” is Simpsons IP, and perhaps the licensing doesn’t allow it in UEFN/creative maps.
If that is the underlying reason, can a different weapon be made available in UEFN that has the same Fortnite characteristics as Mr Blasty, but nothing specific to the Simpsons?
Would that be legal and acceptable to your IP partners?
To illustrate the idea, let’s say Epic added a ‘Not Mr Blasty’ to UEFN (you can probably find a better name 
). The Not Mr Blasty would not look like Mr Blasty, there’ would be no Simpsons IP at all - but it would have the same Fortnite IP as Mr Blasty (same weapon characteristics).
It would be great if players could get experience with how every weapon handles in creative maps, to be better prepared for BR/etc maps.