No kiho in this one. I'm guessing writ of the wild will though

Not saying they're perfect solutions to all situations or anything, just that the system contains a surprising amount of overlap in "where you can use things", and its just a question of being creative in where things apply.  Shuji that are useful in combat, Kata that are useful for social situations, kiho that are too.  "All arts are one" as one particular shuji says...
 
It's one of the things that I enjoy about the system.

Tactical Assessment...yeah, i can see where I could use that actually.  Learning advantages, and negating disadvantages.  I'd also debated picking it up in general recently.  Think ill add that to the short list.

You're essentially immune to persuade, but most of the time, the PCs aren't the ones being persuaded, it's PCs v NPCs with the 'target' being the lord in the local setting.
It is nice, though - since it avoids a lot of deceptive shuji, like Wolf's Proposal being useable. The main risk to you is being compromised, since that's vigilance 1, kiho or no, and unmasking in a court scene is generally a no-no - so anything boosting composure or reducing strife will be good.
Not having shuji does make it harder to get really into an intrigue. The main thing I'd suggest is the Tactical Assessment Kata. It works on initiative checks, and whilst your 'turn order' in an Intrigue is largely a matter of Status, not Initiative, you still make the initiative roll. Advantages and disadvantages are key weapons in intrigues and being able to identify/reinforce/bypass them makes you very useful.
 

First off, I don't have any shuji...that was the joke, Earth needs no eyes is my best shuji...Its come in handy a couple times when vigilance was handy to have for a social scene.
 
And yeah, kinda going for a classic "blind swordsman" sorta role.  ENNE helps me avoid bumping into everything, though the GM hasn't decided if he'll let it help or not in combat, said he'd rule on that more permanently next session.
 
Scholar stuff i've kinda started poking my head towards that too...might be a good one to put more XP towards as we move along.

From my understanding, no.  The kiho is active till you change to another one or end it by choice.