I hate to rain on your parade, but I find the likelihood of getting something for Shuren pretty low. While nothing is for certain, it seems like the time has passed.
Week 21 has just completed, and in week 17 KZ got a letter from home that he told Ming Hui had been written a month ago.
In that letter written around week 13, Ru said that Shuren was deep in mediation and would be ready to take the step 'in a matter months, if not weeks'.
So it seems more likely than not that Shuren is literally about to take the step now, or has already started.
So time is against KZ in a major way.
The other obvious impediment is: how does KZ target focus a warlord tier material? It can't be as easy as [X] Write-in: Search for a big dick material. It'd just be take a bunch of specific material searching actions, which exist under the Craftsman action list, but have never been taken iirc and hoping for a lucky roll. I don't have to tell you how impossible it'll be to convince the thread to do this, especially given the potential that it'll be too late anyway.
The only reasonable way I can see KZ getting a worthwhile material in a timely manner (that's probably still too late given the timelag in sending a mat) is if by random chance, sitting alongside the Lord's Regalia there is something appropriate.
Then there'll be the keep it/send it vote/drama.
So yea, nice idea but it doesn't really feel plausible.
RE: Physical hammer techniques, I previously stated that if KZ didny get a Steel/War anam hammer technique that it'd be a failure of not trying hard enough.
I still think this, but I also think that getting a GOOD physical hammer technique is also worthwhile, strictly because phys techs are basically the 'autoattacks' of combat that don't use anam.
Having a decent one as filler makes for a strong baseline so that KZ doesn't gas himself out in a fight, also because the +1 melee tech grade talent is pretty good at turning something decent/good into a staple.