Are these triple-dots of augmentation possible?

[Graham King]

Here's a little thing that has got me stumped.

Is it possible to add three dots to a note glyph, thus:

>     O:.
to signify that the duration of the note is to be multiplied by 9/4 ?
And can this be done in such a way 
(i) that the dots avoid clashing with staff lines, and
(ii) that the note glyph changes correctly under \shiftDurations ? i.e. so that, say:
>     c1\wierdDots                            % displays the note above, 
>     
>     \shiftDurations #1  #0 { c1\wierdDots } % displays a 3-dotted minim, and
>     
>     \shiftDurations #-1 #0 { c1\wierdDots } % displays a 3-dotted breve.
(For "simplicity" it is safe to assume that the second argument to \shiftDurations will always be zero).

Grateful, as always, for any insight, even if on this occasion it is just expert advice to give up!

-- Graham