I 3d printed most of the bits for a Kosh Naranec costume. he could be a court magician… and it would still fit with the lore in bab 5, too. (oh. you said you don’t want something over the top…sorry. the best part is you can set up some motion activated light shows and play his various enigmatic one liners, stand the thing up in a corner and go get a pint someplace else; without ever leaving character. The avalanche has fallen. it’s too late for the pebbles to vote.)

alternatively you could do an “actual” court magician. or something to that effect. 3d print baubles and a top to some kind of staff. generic robes in black with a big baggy hat to round it out. learning some slight of hand might help sell it.