Possible professional photography day at Aldwych

With the spiral staircase at Aldwych apparently being such a major concern, why could it not be arranged for the group to assemble at Holborn for a specially laid on train to Aldwych. Although access to Holborn's Platform 5 is closed off to passengers, I assume that access is still available if needed. Museum staff could be stationed at the entrance to the platform to ensure that only those with tickets are allowed past. The train, having discharged its passengers at Aldwych could then return to Holborn Platform 5 and remain there until needed again at Aldwych.
Tickets could emphasize use of the special train and make the point that anyone who is late reaching Holborn has missed the opportunity.

As it happens, I suggested something vaguely similar as an alternative way to open Aldwych.

People go in via Aldwych, down the stairs to platform level - then walk through the tunnel to Holborn, and exit there.

With basic crowd control and timed tickets you can avoid the need for guided tours, just put up information boards as needed and have stewards at each of the key locations.

You get two disused stations/platforms and to walk through a tunnel. Tickets would sell out in minutes!

Don't know where the 72 MKI is at present, but if it's not back on the branch somewhere, it's quite difficult to get trains on/off the Aldwych branch these days. Only the northbound tunnel can be reached from the branch, meaning the train going to the branch must run wrong line at some point to shunt into platform 5. The points that control access to the branch must also be turned manually, meaning that traction must be turned off and then on again. This would obviously have to happen again to bring the train back off of the branch. So it is quite difficult to get trains on the branch these days, and I doubt it would happen.

As for power being there - chop the rails in half at Holborn?