Honeypot safe only works if the real one is well concealed. So then it's only worth having if it's somehow known/assumed that you have a safe at all. (Otherwise just leave it well-concealed and you can say 'I don't have a safe, there's some cash in my wallet and a little jewellery in the bedroom' just as effectively as 'Here is the safe it is definitely the real one'.)
I keep only semi-valuable documents in the honeypot safe. Things like flex spending account receipts, password to my personal github account, and free car-wash vouchers.
Affordable amount of cash in one seems most logical solution. And maybe some dress jewelry. Easy enough for burglar to grab and run away, without too much damage on anything else.