I'd rather deal with a mixed kitchen than an unhappy husband. It's a bit of a pain sure, but I don't mind. He's careful to stick to our protocols so I can eat safely and that's all I need. Fortunately, a mixed kitchen works for us so we don't need to go more extreme.
The exact set up depends on your home and your situation but in general a storage area for gluten is important. We don't have a dishwasher so we have two sets of visually different silverware, plates, pots, utensils, colanders, etc. The only thing we share are pans which I put foil or parchment on and glass pans because we only have two of them. There are three sets of sponges, all different colors, for gluten, gluten-free and intermediate washing for the sink and shared items. The sink gets carefully scrubbed before washing the dishes and dirty dishes each have their own separate area so nothing is confused. I can tell what's gluten or gluten-free but my husband forgets so it's helpful there.
The only gluten that comes in this house is stuff that is premade and not easily replaced- pizza, pizza rolls, his weird little debbie snacks, etc. All baking stuff was tossed when I went and all of that is gluten-free now. All of that is kept in the freezer or in his own cupboard with the gluten dishes. Our counters can never be properly clean and I wouldn't trust it anyway so i have a bunch of those clear plastic cutting boards cut in quarters and some whole so there's a bunch available to grab if i need prep room. I also have vinyl shelf liner from Ikea covering one counter by the stove where my dedicated gluten-free section is. It's easily cleaned, obviously different than the rest of the counters and can be thrown away if it's too contaminated to clean.
I also try to keep masking tape and a sharpie on the counter to mark everything as gluten or gluten-free. We have separate peanut butter jars since he uses it for lunch with wheat bread but the rest of the condiment squeeze bottles or things that aren't used on gluten.
It does take a bit to get used to the separateness of this but it's really pretty easy to keep up. The worst thing is by far the lack of a dishwasher.