That is the most important factor but not the only one. It will probably be possible to calibrate the straw to get somewhat usable data, but there are a few major things at play. First, you need a static source from immediately next to the inlet to reliably find dynamic pressure. Static pressure varies all around the plane, so you also need a clean source for static pressure. Pitot static probes are the most common way of achieving this where the static pressure is measured on the sides of the actual probe. You could calibrate the whole plane, but sticking a plane that big out a car window seems sketchy. Second, and a lot less important, the sharp inlet on the straw will be much more vulnerable to changes in angle of attack and sideslip. I don't think that will have a major impact though. Probably the most important thing is just having the ability to precisely calibrate it. If you have a well characterized geometry, you can just read the specs, but when calibrating manually, you're limited by the precision of the measurements you take while calibrating. A 5 mph precision might be 10% or more on an EDF like this. I do think you'll be able to get some data, but it might be too imprecise to be very useful. I would also actually be worried about the rigidity of the straw, even on an rc plane. It needs to stick far enough out from the nose that it gets clean air, but that might be far enough for it to buckle. I had a coffee stir for a while as the fake pitot probe on an Me 163 and it needed to be replaced every 3 or 4 flights.I'm not so sure I see a logic of why they need a very precise geometry. Mainly they need a very un-confused incoming vector for air flowing. They can't be behind the prop, they can't be next to the body... they have to have some finite (on real plane not very large) distance from other parts of the plane. Any complexity on real planes tends to be based on making them robust... for rain, ice, hanger rash, etc. Beyond that... any special geometry may be because of attempts to make it relatively linear with respect to the ram affect going on... because of the instruments of the day when it was first created (and many decades later) that relied on mechanical bellows, levers, springs and such to turn a mechanical dial.
A straw (as the tube) would never be found on a real airplane... simply not sturdy enough. But it separates the flow from that... that only goes into the tube versus that, that cleanly does not. I would think the leading edge perimeter of the straw is equal to most any (real world) leading edges on a precisely machined pitot tubes after being in the field for a number of years. Not having actually tested it (yet) I believe any malformed non-linear geometries of a simple straw can easily be a corrected in a microcontroller using a mapping function... that NEVER could have been duplicated in a mechanical device.
I can very easily be wrong and will gladly air my failure, but that is my premise going into the experiment.
I think I've seen a 3d printed head with a coffee stir tube used in a pitot-static application, though, so that might be a way to get slightly more reliable results.