Ok, well failing that, or even with that measure in place, here is some more information about starch.

Back when DH used to wear ironed uniforms every day, he used to get a liquid starch in a large 1L bottle and mix it up in a spray bottle and use it like ironing spray. It seemed to work a treat. I personally wouldn't use anything in an aerosol can, but the spray bottle means you can make it as wet/starchy as you like (or not) depending on which part of the thing you are ironing. eg. collars = lots of spray. back/front of shirt - not so much.

FWIW you might find ironing easier if you hang the shirts all smoothed out on a coathanger to dry. Always pre-moisten them a bit before you iron.

Also, I'm not 100% sure what kind of fiddly bits your DH's shirts have on them (does he moonlight as a Liberace double?) BUT there are methods to get the collar, cuffs, shoulders etc done with a minimum of hassle. There are a few youtube videos on it. This one proves that men can and do iron shirts well.