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This is one of these problems where there probably isn't a cure but more you use a certain method to reduce it happening.
The creaking is caused by the disc moving slightly between the brake pads.
You can try things like changing the way the vehicle faces on your drive or pressing the footbrake fully before applying the handbrake.
It's a fairly common occurrence on modern vehicles which have disc brakes on the rear and calipers with integrated handbrake mechanisms.
I understand these are things you might not want to hear but you should try them to see if any help the situation.
I couldn't say 100% that it would. If you do fit new discs then you should also fit new pads.
You should try the things I suggested though to see if it makes a difference, especially pressing the brake hard and then applying the handbrake.
Changing the discs and pads will probably help, but I suspect it will only be for a while before it starts making the same noise again.