I would check with day care to see what foods they see him accepting.
Then I would basically do a baby-eating boot camp with different types of foods every day to try out the foods that he will accept. That should give you an idea of a menu that he will at least eat and then you can look at trying to work in your own dinners to his regimen. I don't think there is any way to avoid the "short-order" cook syndrome in the short term being that he is in a little bit of upheaval.

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My DD doesn't like rib meat simply because it is too tough.

Try:

Cheerios
fruit pieces or slices (Moms even cut grapes in half)
raw veggies - my favorite is cauliflower because it isn't as much of a choke hazard like carrots and it is slightly sweet
hot dog slices - not rounds because he could choke but short wedges or half circles
cheese
yogurt

Let him chew on a mini-bagel, too.

I forgot about all those choke hazard foods.

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"I've been rich and I've been poor but independently wealthy is where it is at."

When my picky girl won't eat anything else she always eats her yobaby yogurt. She would live on cheerios and gerber stars if I let her.