The daffs are definitely 'cool, dry, shady'. Net onion bags or real bulb bags help to keep the air circulating around them and any mould at bay. The Iris - depends what you're planting. Dutch, English, etc Iris can stay out without harm. I'd put I. reticulata into pots, and bucharica. They like a dry summer - but not out of the ground, as far as I can tell. Past a certain point they are more likely to look like cooked chestnuts than lively bulbs. The leaves sort of start, then yellow, wither, and fade to nothing but disappointment. Muscari tend to get a bit rubbery if left out of the ground, particularly about now as they'll be initiating new roots for the coming season. If you're not talking 'zillions' potting up could be the answer. They don't mind being transplanted later, IME.

I have three varieties of Dutch iris that bloom in three distinct waves. Earliest is the common sky blue, then a yellow/blue combination called Oriental Beauty, and last a dark, almost navy blue that was supposed to be Sky Beauty but obviously isn't. Here, the sky blues bloom with the bridal wreath and the earliest roses. Oriental Beauty blooms with the ranunculus and yes, a few early bearded iris. The navy blues bloom with the mid-season iris, giving, as you've planned, a wonderful and effortless contrast in form and color. Dutch iris foliage comes up in mid to late fall, survives our occasional hard freezes, and then dies back for the summer along with the daffodils. Here's Oriental Beauty and Roper's Revenge - a bit gaudy! And this is Spartan with the navy blue Dutch iris.

I would be interested in this too. :) do you have a cold room? ... we have one next to the basement, underground. It is unheated and around 5 degrees C all winter.... just above freezing. if you did have, it might be a consideration. we also have an unheated attached garage but it does go below freezing in there. I would be very interested in other answers. :)

I like the term "herd"! I never have used bleach and it has been okay. We are drier here than a lot of places, though, and don't get too much rot.