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Well, you're really exhausting your options here (and possibly your IT department's patience). Iodine would still be an option, it creates a tunnel through DNS traffic. Nearly impossible to block/filter out but you shouldn't expect a lot of bandwidth. Try it out! Although if you're only going to use low-bandwidth applications through the tunnel anyway you might as well use your own mobile data plan instead of your school's WLAN.
You can however skip the VPS part if you run your own wireguard or OpenVPN server at home and route your traffic from work through your home. See this for a dead simple wireguard setup https://github.com/wg-easy/wg-easy. Your home takes the VPS place in that example. There are some limitations though that might depend on your ISP. If you are able to selfhost things in general and make them accessible from outside your home with your ISP setup, then you should be able to use wg-easy and not need to buy a VPN or a VPS.