Thank you to everyone for the wisdom you shared. It is much appreciated. There's a lot to think about.
I do think that I could shoot a Hill style, straight grip longbow, based on the following:
1) I have learned my left arm form from watching Jeff Kavanagh's YouTube videos, as well as John Schulz's video and clips of Howard Hill. Jeff especially stresses pointing the left elbow backwards, rather than down, which goes along with John's advice of bringing the left arm straight out perpendicular to the left side. Doing this naturally allows for a bend in the left elbow.
2) I use a full contact grip, pushing through the base of my thumb, even with my current cheapie recurve bows. I have also had a chance to hold straight grip bows in Craig's shop (I visited during a business trip). I keep all four fingers slightly loose while coming to full draw (to insure that I'm not putting torsion on the string relative to the bow), then lock down on the grip prior to release. I don't just hold with my upper fingers as many recurve shooters seem to do, but keep a good solid grip as Howard advised.
So for both of these reasons I think that I could comfortably shoot a Hill style longbow. From what I've read here on TradGang, to be able to successfully shoot the Hill style bows, you should keep a bent elbow, as well as a firm grip, both of which I've been working to develop. Mind you, I haven't actually shot a Hill style bow yet (only having gripped them), so this is just my presuppositions speaking.
I do like the idea of having one sent to me to try prior to ordering my own.