As week by week goes by the curios sold by xür get more and more useless... Upgrading rare sparrows to legendaries are ok but as the games been out a while, the 2 raid sparrows and stunt sparrow available make it redundant.
Why not have him sell exotic emblems, shaders and maybe even a class item or two to spend our strange coins on?
These could be randomised so they only get sold every once in a while so they would be less common...
Also pricing like
Emblems 15 strange coins
Shaders 20 strange coins
Class items 25 strange coins
(Pricing highish so that they are not a common thing, plus there's a lot of easy ways to get coins nowadays!)
Would add something different to the table when he comes on a Friday, also adds diversity to most of the shaders seen.