So here is a file where I cut the non-developable revolve in half. Now I have a surface I can "flatten" and place my objects for the flow.

[method] I flattened the half surface then grabbed it's edges and ran "morphbetween2curves", then used arraycurve to place my objects [method]



But, your other issue is you cant really "flow an arc" onto a non-developable surface and expect it to stay an arc. It will deform to stretch to the surface.

Here you use the "rigid" check in the flow command.... Most likely you will want to sink the objects down into the flow, because the rigid tick can leave edges of the perfect "flowed" arcs hanging out of the flowee surface.... So bury them down a bit, so they can be trimmed with the flowee surface at their base....