So, I can see three real ways to make 'Dwarf Museum Quest' work (though probably not in the way that would make them useful options for this quest or for Boney); the first two about doing non-Dwarven archaeology while tiptoeing around guild/cult/clan secrets and grudgelore, and the third about the diaspora.
Firstly, I could see a literal DL spin off where Belegar makes a different decision with the vaults of 'no way are we going to consider the Skaven, the Tomb Kings, Nagash, the Beastmen, the Orks, the Vampires, etc etc as the rightful heirs of this stuff' - like, 'it would be shameful for us to claim it as our wealth, it would be shameful for us to be bad custodians and get rid of it, it is dangerous and useless to us just sitting there and we do need wealth and prestige... hey, maybe a museum? None of these people had strict secrecy contracts with us... and there are no heirs...' and then having to go do various kinds of non-Dwarven archaeology to back justify that 'yes of course this is a legitimate thing' while also using it to do various soft-power and tourism income type stuff.
Second would be the nightmare mode version of this, where a Dwarven High King founds a museum as a way to try and do 'carved in stone type diplomacy', with the targets varying based on what era it was in, while trying not to start any blood feuds with the Dwarven Kings and Queens along the way. (For a blatant example, a wing dedicated to the life of Sigmar to try and push some particular agenda with the Church of Sigmar etc).
The Third would be Imperial Dwarves trying to build a museum to Dwarf stuff, and would involve a lot of 'trying not to get smashed by the Karaz Ankor or the Cult of Sigmar'.