Satchel charges should already have priming devices, usually timed. They're ready made explosive packages so they should already have a detonator. If not, then the wiki ought to be edited to clarify this.
There's only one type but the quantity of the explosive package is variable. Saying "Three Plastic Explosives" could mean three plastic explosive packages (of which I can determine the charge) or three blocks of plastic explosives. The latter, if you read the wiki, is rather weak against armor when used singly. So I chose to interpret it as three explosive packages. Nor did you mention that I couldn't make "improvements" to them. I've already said that Takamori likes to make non-standard explosives. If I had a bag of marbles, I'd have stuck the marbles into the plastics to add shrapnel. Bullets will have to suffice for the shrapnel.
Give the pyromaniac even that much vagary, he WILL go for the more liberally explosive definition. And if you say that you want to be safe, then I will, liberally, interpret that to mean we're playing things safe and nothing's safer than bringing more than the minimum.
I don't see why anyone would complain if I brought lots of explosives.