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I will answer this for my forfathers fine country. Porsche standard spec is for min of +.3mm to +.45 with a max wear of 1.0mm. I know you are near the mid point of wear exceeding the intial installation but I think you will be ok. This most importand is the ring side clearance which should as close to .05mm. It sounds like you have been given aftermarket rings which are ok, next time I would have the JE's ring lands cut to the stock ring package from Porsche.
your situation will work fine but "caution" use a lite amount of WD 40 when installing don't over oil the piston skirts when installing, it will take forever for you to seat the rings to the barrels and you will have a smoker.
regards
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