Electric matches are used by the thousands in fireworks shows and often in series with other ematches.The main problem I have with the “measured resistance in series” solution is that it both limits me to specific igniters (or whatever you want to call them), and requires me to trust that they always have the same resistance regardless of manufacturing and environmental conditions. I don’t like to design things where I have to trust someone else got their end right. I *could* literally check the resistance of every igniter I use... but that’s too much work, and what if I forget the meter? No thanks.
But still, if it’s too much work to measure the resistance of ematches for a little piece of mind, there’s probably nothing any of us can say. I would do a bunch of them at a time at home and set them aside in groups. Then just grab a group large enough to support the cluster you have planned. Then it doesn’t matter if you forget your meter. Also, using checklists can help you not forget things like meters.