Sparkplugs are sparkplugs. You get what you pay for. I’ve used lots of Champions.
If the head is off drill it from the inside and maybe the drill bit will turn it out of there. Try to head the head. Al expands much faster. It doesn’t need to be that hot. Put it in the oven for a few minutes or run hot water from a sink over it. Try to rotate it clockwise by hitting against the side electrode with a chisel. If it breaks off just try hitting the plug with a cape chisel tangent to the hole to make the plug turn.
Worst case you’ll have to drill it. If you can drill it from the inside the bit should unscrew it before you drill all the way through anyway. If you can’t drill from the inside get a LH drill bit and drill from the outside.