I messed up!

[Dustytome]

Put them on the MB for a little less than vendor price. You'll lose a little but at least get something back from someone who doesn't want to pay the full vendor price.

Those have to be crafted so I would very much advise not going by vendor price when selling them. Just put them back up for sale for what you purchased them for or a bit higher/lower depending on what the prices are on the market board for them at the moment depending on how fast you want to sell them.

is there anyway to do so?

Afraid not. The Hingan Roof Decoration, Wall Decoration and Placard are the only exterior fixtures that can be used in districts other than Shirogane. The Roof (also size specific), Exterior Wall (also size specific), Window, Door and Fence fixtures are all district specific.

Hingan = Shirogane
Oasis = Goblet
Riviera = Mist
Glade = Lavender Beds