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I have maintained numerous cars (not all Porsche) with CIS (and still running mostly stock CIS on my '75 Targa). The CIS setup on the '75 is, my opinion, the simplest you can live with (at the expense of a slightly more complicated WUR).
The AAV is almost never the cause of a vac leak. Bad boots, hoses, injector seals and sleeves, and air boxes are almost always the cause of the vac leak. Intake runner boots are a maintenance item - you just replace them every so often (or you replace them when they fail and hunt for the reason why nothing runs right).
You want the decel valve - CIS with no decel valve is a popping annoyance.
You can eliminate the AAV, but you'd need to add a hand throttle to keep the throttle open a bit until it's warmed up.
You can pull the CIS off with a partial drop. Not easy, but not impossible either...
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