I suggested the chocolate block, because we used those in Europe on
all sizes of conductor. House wiring was 220V of course. Wire nuts
were prohibited as inferior, and I have to admit they are, though they
usually work.

I've never checked NEC and don't know if the chocolate block is legal
here. But it's completely secure, and completely checkable - you can
see if you got the connection perfect or not, unlike a wire nut.