Massdrop is currently offering a bluetooth adapter for keyboards. However, it's not that good. From what I've heard they may also offer the Varmillo FC660M (because they are currently offering the Varmilo VA87M), which is practically a bluetooth and backlit version of the Leopold FC660M. It's a bit pricey, but you may want to go for it considering the amount of features it packs and how there aren't many bluetooth mechanical keyboard options in the market at the moment.