🚧🚧🚧🚧🚧 WORK IN PROGRESS 🚧🚧🚧🚧

This solution splits all the traces with different zorder into auxiliary subplots, then sorts all the subplots by zorder, and sets the subplot with lowest zorder as the main plot and the rest as overlaying subplots.

For example:

Context:

• There are 2 traces in the subplot xy with zorder=0 and zorder=10.
• There is 1 trace in the subplot xy2 with zorder=5.
• The y axis overlays the y2 axis.

This solution will:

• Create an additional subplot xy-over-2 for the trace with zorder=10.
• Set the subplot xy as the main plot instead of subplot xy2.
• Set the subplot xy2 and subplot xy-over-2 to overlay subplot xy.

(Naming for the additional subplots '-over-' can be discussed)