An exact replica of the WTC complex is built. Down to the very last detail - office furnishings, paper, the lot.
You and any experts of your choice, preferably those who also believe it was a controlled demolition, are allowed to inspect the entire building, in as much details as you want, until you are happy there are no explosives at all (of course, that much explosives would be obvious, but you can take your time, as long as you need).
Then, planes are flown into the buildings, in exactly the same way as on 9/11. Same speed, course, angle, same planes, same weight, same materials. Remotely flown of course, but even with dummies in place to simulate passenger weight.
You're on the top floors of either building. So you're safe. The only danger is smoke inhalation, but you've got loads of air tanks and breathing masks. You're good and safe up there for a few days if needed.
The ONLY possible danger to your life, is the building collapsing because a plane hit it at high speed, caused serious damage to many supporting columns, and is now burning hard.
Would you agree to stand in it? If it was a controlled demolition, then surely there's no danger right? There's firecrews (hundreds of them) on hand ready to put the fire out in due course, and they'll be able to get you out, assuming it doesn't collapse.
As a bonus - those who believe it was only WTC7 that was a conspiracy (not sure on the logic behind that one, but I digress), would you agree to stand in WTC7 while the exact same damage was inflicted on it, once you'd satisfied yourself there were no explosives in the building?