would a home builder consider trading a semi-new home back for a newer upgraded home?

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No, the home builder will not agree in trading a semi-new home into a newer upgraded home. Its better to contact a person who is involved in home buying and selling process.

99.9 never. Sell the old house and buy the new house.

no, the builder is not in the market of flipping and trading houses, it won't be worth their time to deal with this transaction.

Just contact a real estate agent, explain your situation and they will help you list your current house for sale and search for a new one.

As a general guideline, you need to stop trying to upgrade every 6 months. Maybe this one time it makes sense, but the real estate fees and other per-transaction costs are astronomically high if you average them into a 6 month period. That's why most people rent until they're fairly certain they're ready to stay put for 3 or more years.

Nope..builder has his profit and is moving on. Homes are not like cars where you trade them in, not to mention the builder will have to absorb any costs from transferring ownership, etc.