I am on the side of providing a cheap, unsentimental bike. Thieves don’t look at a bike and think “Sweet Colnago!!” To most of them it’s a thing they can get scrap value or flip for small amounts of cash for their immediate wants/needs. Beater cruiser with bolt-on wheels and seat or something similar would be my choice. If the OP thinks this is a good idea I have a rusty Trek Jazz that could be had for VERY little $$.