Obfuscate and true sight

I know we have recently discussed this somewhere, but I can't find the topic.
Anyway, I have made some experiments if it is possible to turn true sight off if the player has a certain level of Obfuscate.
But it seems it's impossible to change things that are set in the npctemplate.
It might be possible to change the whole template, but I can't script something that does it all by itself.

while this does push Obfuscates power even more, have you considered just giving Obfuscate a +stealth effect? Since true-sight doesn't seem to find stealth anyways. Would seem to treat the symptom you are worried about, even if it forces you into the slowwalk.