Our company have come up with a two eng taxi checklist for use with long taxi delays. We still have to start all four initially then we can shut down 1 & 4 with the green elec pump running. It took a long time for this checklist to be sorted out with AI.
I saw a Qatari 346 taxying away from the pushback the other day at LHR having only started 2 & 3 and it set me thinking what other operators are doing.... over to you
its a long time procedure in our company just be careful when turning, you might get off the centreline