Hi,
I really want that too, but after searching, I'm 99.9% that nobody makes it. I'm sure once my kitchen is done, it will be released!
I think I'm going with a range flanked by a two burner induction hob and steamer, but that will take more space than you have. The only solution I know of are the mini integrated pieces from Wolf (from other posts, I think Gaggeneau and Miele may make them as well). You can get a 15 inch gas two burner piece (I think they call the mini pieces hobs), a 15 inch two burner induction hob, and a 15 inch grill ... this is all bigger than your space allows but perhaps they can be put in horizontally and behind each other??? From the posts it appears the gas and grill hobs are not considered as good as on their cooktops or ranges, but I don't know why yet. If anyone out there has an opinion, I would also love to hear it.

http://www.wolfappliance.com/IntegratedModules

I agree that the only way to get that combination is to get individual units.

Actually, "hob" is British for "cooktop" though it originally meant "burner" (and before that, "fire"), and can mean either.

The individual units are usually called "dominoes" or "modules".

Gaggenau "Vario" has a 12" grill and a 12" gas, but the induction is 15" wide. Plus, I think when you line them up you may gain an inch. The 12" units seem fine, but the 15" ones are the ones that seemed as good as full sized. They're very expensive, however, and would be the 45" you don't have.

Miele "Combisets" also have 12" "barbecue" (which they also have a griddle for) and 12" gas, but their induction is also 15". I don't know what happens when you combine their different sizes, but when you put three of the "twelve inch" ones together they show a 33.5" hole, so you might be able to shoehorn it in, if they can combine them.

Wolf are all 15".

Miele is known for their customer service, so you could give them a call and see if they could fit you up.

Can you find a 30" gas with grill and add a double induction unit next to it?

The steamer does not need ventilation so you could put that away from the stove. It is really neat looking and would look nice in many locations. Just need to drain it - 1 inch hose and it could go a long distance. You do want it close to water.