It turns out that this poison ivy thing isn't very fun.

This is the first time I have had it, I thought that maybe I wasn't allergic.
Same here... never had a problem with it and suddenly a few weeks ago I caught a nasty dose

(or maybe it was something else... same symptoms regardless). Anyhoo, look for an ointment with stuff in it that ends in "caine"... benzocaine, lidocaine etc. Cortisone lotions and benadryl don't do squat in my experience. I found this stuff at Wally World; it actually killed the pain and itch enough that I was able to leave it alone and the infection healed up in just a couple days...
One of the "problems" with Spyderco is that they almost have
too many interesting knives from which to choose

I did a re-grind on a plain-edge SALT and was really impressed with it... full size blade, seemed very sturdy with solid lock-up, but also slim and lightweight. So that's worth a look.
But i havent ever asked about re-heat treating something or changing the heat treat on something so im not really sure.. Although i dont "think" the price would change.
It's no big deal as long as the grain structure wasn't completely blown up in the first place; the original HT basically goes out the window as they heat it up for normal austenizing, and starts fresh. I included a handful of NOS USAF/USMC blades with other new 1095 blades one time, they came out perfect. But for one small blade, the cost and shipping would likely be prohibitive.
most of the knives we've seen break, are "right there"...
I'm not so sure it's the tang cut-outs that are at fault. You have to try pretty hard to break a 1/4 x 1/4 piece of square stock if it's hardened and tempered properly...
I'd
really like to see a side-by-side comparison between certain knives that have been known to break "right there", with one group being heat-treated the same hardness all the way through the tang, one group HT'd fully and then tempered back further on the tang, and one group partially-hardened with the transition area being "right there".
At the risk of being burned for heresy in some circles, I am not a big fan of partially-hardening any blade. I really think it causes more potential problems than it helps.