"web." rather than "www."

<<Another suggestion that I've seen is "sextuple u".>>

I've also seen "wee wee wee" and "woo woo woo" as suggestions.

Well, somehow I guarantee they're not gonna catch on... So, yes, it would be funny to say those things as a joke, but nobody'll take them seriously. I've taken to writing "tongue" as "tung", "group" as "groop". I insist, to my teachers, that Webster suggested those, and thus they are correct. None of them agree.

>> I've also seen "wee wee wee" and "woo woo woo" as suggestions. <<

I am sure that no-one would have any idea of what you were talking about, and would assume that you hadn't any sense at all.