I actually don't think it would be that uncomfortable to wear on the inside of the leg, as long as it was on the opposite leg you normally wear it on. For example, I'm right-handed, so on the outside of the right leg would be where it normally goes. If I were to wear it otherwise, it would be on the inside of my left leg. It would be much easier to reach there than inside the right leg.

When I first got SCUBA certified, I used to wear my dive knife (or BFK) on the outside of my right leg, where it was easy to reach. Someone pointed out to me that, on the outside, it was easy for the knife to get caught on fishing line, or vegetation or some such thing, and that I really ought to wear it on the inside. That made sense, so I switched, and promptly lost that knife. And the next one. I don't carry a BFK anymore.