Just in case it's useful for anyone else.
I bought a sealey manual tyre changer years ago (similar to this https://www.ebay.co.uk/itm/383454387421). Works great once you get the knack (get some tyre soap, push the bead as far into the wheel centre as possible). Requires bolted to the garage floor using something like this (https://www.ebay.co.uk/itm/361398824822) . Unbolt and fill the holes using countersunk bolts when not in use (similar to https://www.ebay.co.uk/itm/111284266897). Definitely requires a lever/bar upgrade for alloy (and even steel) wheels. I use something like this https://www.ebay.co.uk/itm/384121088593.
Andy
