Assume your preferences are toward C&B revolvers. My favorites for a long, long time. I have used a carpet bag, with internal pouches many times at NCOWS matches to carry all my ammo, brass, tin cup, pocket pistol & accoutrements for management of cap guns. At an opportune time during a stage, I'll simply take a 5 minute sabbatical to "charge" 2 revolvers with powder & ball. Going to nearest empty shooting bay, when possible. Obviously, we'll cap at the loading table. My pistols feature 8" barrels & I use the on-board rammer to load. I also use a white paint pen to mark my designated "empty" chamber (nipple) to improve both speed & accuracy of the loading process. I place both pistols on table, half cock both. Charge 5 chambers, then ram a ball over each. Proceed to do same on pistol #2. I like a dab of lube, so I do that last ($1 condiment dispenser - hide in a canvas of similar bag). I also recommend using one (or more) cappers as these save time. This system works for me, the important thing is develop a good system for you. Another quick loading tool I use ( with my 44s) are a spring loaded powder dispensing flask. I've had mine for around 45 yr. Its a time & finger saver. Maybe those are still available somewhere?...
I also carefully prepare my revolvers prior to the match, including charging each with powder & ball ( not capped!)
Very small posse makes a challenge, if this happens, I ask for everyone to take "5" while I get prepped. If I think that's a possibility in advance, I'll skip initial charging & take a set of cartridge conversions or maybe something "unusual" to shoot in case the numbers aren't there.
Hope there's something here that may help you.
Regards,
Slim