Osprey,
I feel for you, And for Bob!
I can not speak for anyone else, but am sure this event was supposed to be a fun thing, yet certain rules seem to be required, and the more this was discussed, more over-sights seem to come to light.
I know this is upsetting to all, But, not intentional.
FWIW, I too thought to use a smoothbore,( both original matchlocks and home-mades,) But, all have rear sights, LOL!
Then I thought about percussion and yes, have two I could use,....then remembered one is an 1840's original pattern F EIC musket. ...it has a rear sight too!
The other percussion is a cut down P '53....and It fires a minie type so it's out as well! LOL!
Still, we must look on the amusing side of this, and not get bent out of shape..
I still have a flint rifle or two. :-)