Since both rifles use a small firing pin it's doubtful, even if you found a compatible plug, they would ignite a cap. I think you'd be money ahead to find a compatible rifle. Many of the older inlines, like Knights, are easy to set up with musket caps. Also the two rifles you mention will not meet Idaho regulations in regards to visible ignition if that's where you're intending to use it.
"LEGAL IN MUZZLELOADER-ONLY SEASONS
A muzzle loading rifle or musket which:
Is capable of being loaded ONLY from the muzzle.
Is equipped with a single or double-barrel.
Is loaded ONLY with loose black powder OR other loose synthetic black powder.
Is loaded with a patched round ball OR a conical, unjacketed projectile comprised wholly of lead or lead alloy. No sabots.
Is loaded with a projectile that is within .010 of an inch of the bore diameter.
Is equipped ONLY with a flint OR a percussion cap OR a musket cap. 209 primers are prohibited.
Is equipped with an ignition system in which any portion of the cap is clearly exposed and visible when the hammer of the weapon is cocked and ready to fire.
Has no scope, only open or peep sights. Fiber optic open sites are permitted.
Is free of any electronic devices.
Is at least forty-five (.45) caliber for deer, antelope, or mountain lion.
Is at least fifty (.50) caliber for elk, moose, bighorn sheep, mountain goat, or black bear."
