If you have just 2 slots you can bodge with a piece of bar that fits exactly in a vice. Being long it doesn't matter if the freewheel slides as long as it stays pushed down.
yeah I can see that would have worked on my freewheel, with it's slots standing proud of the lockring. Probably not on a-lonestare's though.
locking bit is recessed
Suntour cassette so got the right tool.
Confucius say: "Wise man when buying freewheel also buys dedicated removal tool, sparing himself much vexation"
Every time I've screwed a block to a hub I've wished I had one of those very thin spacer-ring things to put on first, but never have had one at hand. I think I had a couple from a bike shop years ago-god knows what happened to them. In these 'cassette' days I don't even know how to ask for such a thing.