Hi again apx,
Glad I could help, and that was a very inventive experiment! However, please use the "latigo stirrups" only as an experiment. It could be really dangerous to ride that way. They are not stable, and if the horses spooks, turns sharply, stumbles, etc., you could get hung up or off balance and take a fall very easily. You do not want to injure yourself or your hips!! I also believe that in front of the saddle may be a little extreme. You do not want your legs so far in front of the horse (if you are bumping the horse's front legs as he walks, it is too far) that you lose seat stablity and leg aids/control of the horse. Part of being stable in your seat horseback is the abilty to "grip" the sides (barrel) of the horse lighty with your calves. This would be impossible in that position (especially if you are holding you legs out "one inch from the sides of the horse").
If, however, you do have the desire and funds to purchase a Fallis, you can call John (he is the saddle maker/owner) and talk to him about your special needs. I'm sure it would be possible to custom make a saddle for you with stirrups as far forward as safely possible. By the way, I am an ex-jockey and very used to "two pointing" or standing up in my stirrups, and even with the stirrups more forward hung, I have no trouble doing this in my Fallis. These saddles put your legs and feet in front of you (feels much like sitting in a chair) as opposed to reaching back in traditional saddles, as you mentioned. Again, Fallis' are a little spendy, there are copy cat brands under the name Balanced ride (I think Textan makes one, Simco, Vic Bennet, Foreman). I find all these brands used on-line, often for half the price of new ones. I think all equestrains with hip/leg/back/knee problems would benefit from them.
Please be careful! Perhaps if you take your saddle to your local saddle maker/repair shop someone could alter it for more forward hung stirrups? Worth a try. But please do not do much riding in the latigo stirrup invention, other than to just see how it feels.
Here's hoping you can ride with less pain, Lu