If you're going to fix the gear, I wouldn't be in a hurry to remove everything that made it a retractable gear airplane; you're taking value away from the aircraft.
If you want the gear down, why not simply leave it down?
If you're looking to put bigger tires on it, then you do have a problem if the gear remains retractable, if the tires will bind the gear. Even if you don't intend to use the gear, having tires that are too big for the wells or for unhindered operation do pose an issue. This would still be an issue for a Form 337 change.
You could seek your own STC, but it will be time consuming and expensive, and without engineering data to back it up, I don't know that you'd see a gross weight increase, anyway. You may want to partner up with a DER to see what you can arrange.
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