I had a couple of parking dings repaired when I bought Y1.
I was very concerned that, being aluminium, this may be a problem, but I spoke to a chap I knew (Simon Frost, father owned Frost's Jaguar) prior to purchase. Simon was was one of the first people to bring the paintless dent repair system into the UK and had worked on both my Prelude and S2000 previously with tremendous results.
He assured me that whilst working aluminium is significantly different to steel, he would be able to remove the dents.
I took Y1 to him and watched for a while.....when he got out a tool which for all the world looked like an ice axe and stated hitting the door with it I had to go outside!!!! However, Simon did a tremendous job, and explained he had been practicing on aluminium because of Jaguars increasing use of it in body panels. He didn't need to remove the door cards to repair my dents which were in similar locations to yours.
Simon no longer runs his dent removal business (and was based on the S. coast so no help to you anyway). Fortunately I haven't needed the services of a dent removal guy on Y1 in the last 10 years (touchwood) but now use a chap called Ryan Shakespeare on our more mundane cars (though I would have no hesitation letting him loose on Y1 if the worst happened). He is a very talented guy, and we have discussed the differences between steel and aluminium repairs a number of times. He says you must get the fix right first time - aluminium stretches and fractures - it wont take repeated working. Based on this, I would recommend finding someone who has plenty of experience of fixing dents in aluminium.
2001 3.2 Circuit Blue Coupe with pop-ups!
"If you want to argue that The Best Car in the World is a supercar, go ahead. But there is only one that makes the grade. Only one that's built properly.
Gordon Murray knows.
Rowan Atkinson knows.
It's the Honda NSX."
(J. Clarkson)