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Great questions, and very similar to the setup my Regal had for years, so I should be able to provide some insight...

1) EVAP - go ahead and use the Series 2 solenoid, if the Series 3 runs into the TB linkage, as they work the same

2) Yes, the stock brake booster line will work, just put a hose clamp on the ends for security. Then, tap the EVAP hole for 1/4 or 3/8 NPT (whichever is very close), I did this on both my GenV M90 and L26 UIM, for a good source to feed things. It's a solid spot, along with your TB adapter plate's EVAP port directly to the bore, to access manifold pressure for a vac/boost reference.

Suggestion: get a cheap manifold block (~$20-30 on eBay or Amazon) and supply it with the UIM's EVAP port via an NPT elbow and short hose. This will give you 5-6 ports to supply your HVAC, gauge, FPR, WG, etc. (I might have a similarly hand-drawn diagram, but you get the idea).

3) PCV - here's where it gets tricky... #1, plug a stock PCV valve with JB weld or RTV, to block any flow up through the original location under the L26 MAP (you should run the newer style 2-bar here, if you aren't already). The stock PCV valves aren't great for use in this configuration, and that small pathway isn't worth keeping to puke oil into your UIM.
#1a, cap off the PCV path on top of the UIM, if you have a valve cover option, and cap the N* tube as well, because they only work together properly in N/A and M90 configurations that don't see boost in the TB.
#2, I've had the line to the rear of the air filter before, but not sure it draws much. I currently have a closed catch can, with a check-valved 3/8" hose to the UIM manifold supply line, so it draws from both valve covers under vacuum conditions. I'll be adding an A.I.R. injection pump this month for drawing under boost when the relay harness is triggered by a Hobbs switch ~4psi, but that's extra. You can tinker here, but the exhaust will let you know if it's getting blow-by.
 

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Blue, yes, it's very close for one of the NPT sizes, I forget, but here's a shot of mine with both tapped for whichever fits (top plugged)...
Gas Auto part Metal Automotive tire Nickel

The TB port may be useful for a WG port, being open to the pre-TB blade air. You'll want to familiarize yourself with the principles of turbo vac line pathways for WG and BOV stuff.

The L32-style MAP is a 2-bar like L67, but in the same shape/connector as L36 ones, so they drop into the UIM and read properly for an L67 tune.

Welding on a cast aluminum part that needs to not be warped to seal your intake under vac/boost... vs. a dab of goop into the top of a PCV valve... Easy decision for me. Also, the MAP gets its reference from the opening into the UIM.

So far, I've had good results with at least drawing from vac hose thru a check valve, thru the baffled catch can, out of valve cover/covers. You can try the path to have the under-boost draw from the pre-turbo air, but it's a little less useful in my attempts. You'll probably try a few things, including open breathers, if you want to mess around with it.
 
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