Cheap things will ruin something that takes you years to build. I don't see any reason why you are going to buy a PC that is so big and might even take half of table space just because you want to use it as hardware wallet. You are going to be spending much more unless if you are going to be getting it for $10 which is not even possible. Why even risk the Bitcoin you use large amount of money to buy to be store in computer? Is it worth the risk to try such an experiment?

There is nothing palatable about this idea.unless you don't value your Bitcoin or perhaps the Bitcoin isn't that big enough for risk. If that's what's on your mind, that's fine but I don't buy this idea. It will cost you $70 to get a very good hardware that you can use to manage your Bitcoin offline. If you don't tell anyone that you hold Bitcoin, with a hardware wallet no soul will ever know that you have Bitcoin in your life and it will remain offline for life.