I would love to be able to dye that gear. I'm sure they won't, likely to preserve the unique-ness of it (honestly I think I've seen somewhere that that was their explanation as to why they don't make everything dyeable?)
I'd adore a pretty pink Scylla robe or a jet black HA robe. Tbh if the HA gear was dyeable, I'd probably get off my butt and do coil just because of that. xD