I must admit to liking cheap & cheerful as well. I have a bungee sail tie (e.g.tiga tie) looped loosely round each rear bench right at the aft end. These serve various purposes, such as tidying up the sail if we are at anchor with a topping lift on. I can also loop one around the tiller (extension clipped down to tiller) and tighten it’s cleat to hold tiller to leeward either side for heaving to, or loop both round, one from either side to hold it in the middle. Fine adjustment can be made by tightening/loosening the cleats on the ties. Not elegant but can be set up in seconds with stuff you can buy cheaply.