To keep the competition fair you would also need to do it with the same car.. Would you volunteer your 159? Rolling road it, remove the tuning box, stick on Red Dot's map, rolling road it, stick on Angel's map, rolling road it, stick on AutoDelta'smap, rolling road it, stick on Celtic's map, rolling road it and so on. Its a good idea but I can't see it happening, plus its pretty much academic that you can get massive improvements from either a remap or tuning box. I wouldn't put down your tuning box, its obviously good but there are dodgy ones out there.
Each engine is different, as is each rolling road. The differences between the maps aren't likely to be more than 5-10bhp, also each map may be differently suited to different induction set ups, etc..
I would add, that only companies that write their own maps need apply...
Angel and Celtic may have gotten their maps of Red Dot but they have done their own development work on them since, adjusting what they see fit and going down different avenues, like Celtics FMIC set-up.. Its hard to say what is a "safe limit" for mapping a car, its more a gray scale than black or white. There's so many variables in car maintenence, driver technique, pure luck, whether or not a car with a remap is reliable, other than just the remap itself.
A good idea for a project LT, but I don't see it happening so simply.