Can I place the verb type 9
suffix, on a verb which has another verb suffix, preceding ?

Of course the question would be : "why would you want to ?". Right now
I can't think of a reason.

On Facebook recently someone used taybe'wI' someone uncivilized. But I can think of more complicated words. Here's one: HIvqangbe'qa'wI' someone unwilling to attack again.

I would hesitate to include any type 1, 6, or 8 suffixes on a -wI' verb. 1, because I'm not sure about how the reflexive nature of the word interacts with -wI' (but I'd probably accept something like HIvchuqwI' those who attack each other). 6, because there are analogous noun suffixes to do the same thing, except -chu', which seems more important to a noun's fundamental meaning. 8, because -neS would be more appropriate on the main verb of the sentence, not tucked away inside a noun.

-- 
SuStel
http://trimboli.name