I also think the stirrups don’t help with leg position. I had the same problem and I just worked on pointing my toes inward and keeping my knee in but not so much that you are clenching onto the saddle with your knees.
Any stirrups! I genuinely believe that stirrups don’t change a riders natural position. You should be able to ride in any stirrup and have the same position. I’d just recommend getting some basic stirrup irons and focusing on working on your leg position. Once that’s set you can get whatever stirrups your heart desires and have no issues