If you can get the building inspectors to accept the engineer certification from another building of similar construction. You might be able to do that on a si

If you can get the building inspectors to accept the engineer certification from another building of similar construction. You might be able to do that on a single property with 50 identical copies of one design, but one at a time is unlikely. So you build the engineer certified designs and then lobby to get the method of construction included in the building codes.