Maybe this is just semantic twaddle, but as I see it, the 'html
working group' was formed to deal with the fairly narrow issue of
'standardizing HTML', and doesn't really have the charter to take on
the larger issue of 'what should people use on the World-Wide Web for
browsers'.
Why aren't you better off just submitting text/hdl as a registered
MIME type, and urging people to use it?