Retainer Statue!
Could make the retainer with all the options for his character (hair nose horns whatever) but all grey or white to make it look like stone. Not sure what gear he was in but if it is a dye-able model, you could make that all grey/white to match...

Another idea could be to add something to the house placard description (sign at entrance, not sure about spelling). So that the placard itself could be like a monument.

P.S. I do hope you get something that helps. I am sorry for your loss.