I don't know, wouldn't daggers be the one type of equipment that either doesn't take a slot, or can be placed in slots that are completely useless for anything else; boot sheaths, ankle sheaths, strapped any old where.
I though BoneyM said that you can basically hold as many active-use magical doo-dads as you can fit in your pockets, like you can have the seed, a wand of blasting, a grounding rod, maybe a power stone or two, so long as you haven't got so many that you're rummaging through pockets for ages (possibly extendible with bandoliers) then there's no limit to the artificer bullshit you can pull off!