Make geometry nodes compatible with skin modifier

A known issue, described here: reddit.com/r/blenderhelp/comments/z58zav/geometry_nodes_skin_modifier_not_working/

is that skin modifier added on top of geometry nodes modifier simply doesn't work. It doesn't generate any skin because it needs a vertex marked as a root. The marking is done automatically when there are no geonodes below skin modifier in the stack. Applying geometry nodes modifier and only then adding skin modifier is a workaround, but it obviously breaks the seamlessness of the process. Maybe the simplest solution would be developing a "mark root" node that could be added in the end of the node tree? Otherwise, updating legacy modifier by blenderheads seems unlikely.