Call another dealer and ask who they use for their rim repair, if your local dealer is useless.
Every dealer has a repair company for their service vehicles.
I bought my car with under 8,000 miles and factored in wheel repair, center console replacement, and exterior paint chip repair as "we owe".
After the deal I found the dealer misrepresented the car. I will not discuss the dispute.
I walked away from their "we owe". I did not want them to touch my car.
I went to another dealer 30 miles away. I was strongly considering purchasing new wheels.
After pricing them out, I decided to try wheel repair. I could always buy new rims if I do not like the result. I had them do all the work out of pocket.
That should give you an idea how upset I was.
The dealer did the requested work.
When it came to the rims they repaired 2 wheels for $200 total and the job was done in a day.
I also have no vibration above 70 mph

.
The job was absolutely perfect. If I had not taken photos of where the blemishes were, I would not be able to locate the repair. The color was also perfect. Now, I am a car guy and very demanding when it comes to craftsmanship and quality.
You may want to save yourself some time and effort and check with a dealer.
Send them photos and get a quote.