Bivy with umbrella?

Back when I was in my hard-core, no-hipbelt "Jardine" stage I was really into my umbrella. I always used in with my simple tarp to block wind and rain wind by my head at one end of the tarp. Worked like a charm. I assume it would work just as well with a bivy. I assume with a little forethought you could block rain from the bivy opening. Possibly a thin bungee cord from the bottom of the head hole clipped to one the umbrella spokes, or maybe some added material to make sure the umbrella always covered the opening. Maybe some Velcro on the bivy to somehow hold the umbrella firmly in place through the night. Could even drape mosquitoes netting over it. Possibly if you DIY the whole thing you might be able to open the umbrella inside the bivy in an integrated way.

There was a guy on here who had a was propping up one end of his tarp up with an umbrella. I tried it with a bivy like creation and it worked pretty well if you put it up by your head on the inside you can use it as support.

I was thinking just enough coverage to get some ventilation or have some breakfast. Keeping the thing tied down could be interesting.

A small tarp or poncho is a better bet, but an umbrella works with the cowboy camping "throw it down, crawl in and go to sleep" aspect of bivy camping.

I've often used a brolly as a door for a tarp, as well as extra weather protection when cooking. Normally I just peg it down at the end of the handle, although I expect a simple short guy rope looped around the shaft and pegged at both ends would keep it more stable in crosswinds.

My only concern in using it in place of a micro-tarp for a bivi bag, and this would partly be dependent on the particular umbrella used, is that I found that steady rain would eventually lead to water pooling on the canopy, then running off and dripping directly onto whatever I was sheltering, due to the angle at which the brolly was lying. When cooking I could easily tip it back now and then to clear the drips, but if you're underneath it in a bivi then that would not be so simple. I've mainly found this a problem with a Swing LiteFlex model, which forms a roughly flat "top" when you deploy it and lie it down; other models might not have such a severe curve to the canopy and may allow the rain to run off over the top instead of pooling.