should still give you good service.
There will always be performance disparity between front and rear tires at different wear points in their service lives.
There is of course the risk -- always and no matter the tires' condition -- of driving too fast for the conditions and the tires could be called up to deliver more grip than they can and well, this can be serious. One can't always know when this situation might arise either. Accidents come without much warning.
Now many many car owners, me included, drive thousands and thousands of miles in most all kinds of weather without any incidents. However, and I'm sure I'm not alone, I always slow down in wet weather or in other marginal traction conditions and give my car more room between it and other cars on the road, regardless of the state of the tires: new or on the wear bars.
But you have expressed some concern so I think you know the right answer for your situation: Peace of mind and safety come first so if you are that concerned replace all 4 tires.
Wheel repair? Be careful about wheel repair. The factory manuals state that repairs to light alloy wheels are not supported if the repairs involve straightening or welding. Cast material when bent is compromised and even if it can be straightened will not have nearly the strength it had before.
As for welding...On another forum a new (used) car buyer posted pics of the wheels that came on his car. At least one wheel suffered a failure that was clearly due to a botched welding repair.
I can tell you it is hard enough to find a shop that can refinish these wheels right, let alone repair them even if one wanted to ignore Porsche on this matter and charge ahead and have a wheel repaired.
When my Turbo needed its right front wheel touched up from some scuffing it experienced (the wheel was not bend, or dented or had any other damage just some visible scuffing to the surface) the wheel was ruined by the refinish shop and a new wheel had to be fitted at a cost of around (IIRC) $1800. I didn't pay for this though. It was either the body shop that farmed out this wheel refinish job or the wheel refinish shop that paid for the new wheel.
And yes, you read right: $1800 for one right front wheel, Turbo hollow spoke. Light. Expensive. Oh man are they expensive.
Thus my advice would be to replace the damaged wheel in spite of what the dealer and the indy shop tell you. In fact I'm surprised the dealer is advising you the wheel can be repaired. This is as I mentioned above contrary to what Porsche has to say on wheel repairs.
Sincerely,
MarcW.