I use a larks head on the clew with an alpine butterfly as the main knot. This is a single line form. You could just use the alpine butterfly, but then the loop on the clew would chafe and you would have to tie the knot by threading the ends through the knot. It is much easier to tie an alpine butterfly on the bite (right in the middle of the line). The larks head keeps the loop tight on the clew.
To do this, tie an alpine butterfly with a loop large enough to allow you to make a larks head (i used to call that a shower soap rope knot).
The advantage of the alpine butter fly is that each segment can hold the full weight without slipping and if one side does break, the other will still hold.
The knot will slide past the staysail and rigging better than the two line method using bowlines.