You could save your built house, but everything that is in it will be saved, too, included the remains. Not sure if it would save the glitch you are having, or if once you placed your house again, the epitaphs would then becoming deletable etc. I think it might work, I vaguely recall having a house with a glitched picnic basket/blanket in the backyard, which wouldn't go away. So I saved the house, moved the sims, demolished the glitchy house, then put the saved one back on the lot and managed to remove the picnic basket. So maybe you could try that? It might work, and if not, you're no worse off than now.