I’m sorry your husband is reacting so strongly to this. It’s hard to keep a bunny from nibbling at floor height. I understand the opportunity for them to do it.
The best way, of course, is to find another place for them and have the kitchen be off limits, somewhere between outdoors and the forbidden zone. The xpen is very helpful, and if you can house them in it, then let them out for play time only in another room or two in the house, they may learn that it’s not worth getting in there.
One thing that is a deterrent to bunnies is simple white vinegar. Fill a spray bottle with half vinegar, half water. Spray it on the bottom of the cabinets. It is a smell that they don’t like (much more effective than the bitter apple stuff sold in stores) and it also is an excellent cleaner. So you can spray there when you let them out so the smell is fresh. You won’t smell it soon, but they will.
Another thing I have done for carpet edges and baseboards is lay down or prop up strips of seagrass mattes, about 4″ wide. Basically you’re adding a layer of covering, so they have to bite it before they get to the cabinets. Spray that with the vinegar, and the combination may train them not to bother.
Giving them toys to chew as soon as you see they are interested in chewing, and moving them away from there, is both positive reinforcement for doing something else and helping lose the attraction to that spot. Get a play tunnel that leads them away from the cabinets, and let them find rewarding treats at the opposite end. Bunnies understand a firmly stated “No”, but they are trained the best with positives.
Then train your hubby that if he is nice to you and the bunnies, he, too, will get treats. 