If you read the Prussians' 1788
manuals, they do not require soldiers to prime the pan because of their conical touchholes. The soldier draws a cartridge from his bag, bites it, pours it down the barrel and by ramming the charge down to the breach he effectively primes the musket at the same time.
But the Brown Bess and An IX muskets you'll see in Holdfast didn't have conical touchholes. They had slants cut into the breech plugs, but their vents were straightly bored cylinders. This actually caused problems during drill for Prussians equipped with foreign muskets as they needed extra motions to load. If they ever add tap-loading or other tricks for faster loading, it should still include priming the pan.