separate alpha for mfc and mec?

Would it be possible to have a different alpha (transparency) value
for the marker face color and edge color for a single line? (Either
currently or as a new feature of mpl). It seems like by default alpha
applies to them both.

I ask because I am experimenting with getting a different look for the
markers by plotting the same points twice, once with a transparent
marker face color and then again with a fully opaque thin marker edge
and it is a nice effect (see attached image). The problem is, I am
doing point picking, and the two-points-at-one-location seems to be
making the popup I create slower and occasionally mis-positioned.
Although I may be able to work that out, I thought it would be
"cleaner" to just have one set of points.