I don't find that a burr is required when sharpening any type of edge.

I hone my hollow ground straight razors and never get a burr as I never make more than one stroke with out switching sides. I guarantee all my straight razors are sharper than any field, combat, bush etc etc knife out there.

A burr is useful to let you know you have honed the edge down to the other side, but it is nor required to get a hair popping edge.

To answer your question, if you use the burr as an indicator to help you determine when you have honed a side enough, then yes a burr is useful when sharpening a convex edge.