lol, I know what you mean about dark spots. Both my daggers and shoulders have LEDs in them so hopfully it's dark enough for them to be effective.
This looks awesome though. I look forward to seeing it in person on the day
it's very easy to swap out another yes! The glowsticks are originally neck ones, that come with little plasttic attachments. I basically stuck 2 of those to a hairband (as in another pic), and made 2 small holes in the hood. So I just have to feed it through the holds first, place them into the holders on the hairband, then put the hairband over my head and adjust to sit correctly.
I have a pack of about 50 of them, so I'll be taking some spares just incase... but they should last the day I think. I'm just hoping the venue will have its dark spots so the effect is noticable Otherwise in the light it just looks like a tube of plastic hehe.