The way I see it, if I go to the work of taking the turbo apart and porting the turbo, and it still ends up having a little bit of creep under high load (say 2psi), that means you would have to set your overall boost lower (2psi) so that when it does creep, you don't blow the motor. This basically creates a triangle of lost power (graphing where your boost starts at say 5psi, and finishes at 7psi, you loose 2psi down low sloping up to 0psi up high).
Seeing as how you must run a relatively low boost psi on a stock motor, and I most likely will upgrade in the future, I think the external gate is a best way to go.
Ordered a Tial MV-R and 4" flex pipe, should be here tomorrow. Couldn't find 321 stainless steel tubing in increments as small as 1ft, so will be going with 2" 304 stainless tubing for the pipe coming off the header. Will post pics as we get it on there this weekend or early next week.
The wastegate is watercooled though, which may be a bit excessive, but it was the only Tial 44mm now. Considering the Lotus's rep to cook things in the engine bay, it couldn't hurt. Just need to figure the best way to tap it in.