7' Tiller on a Smaller Tractor

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I wouldn't remove anything from it. If it's too big, sell it and buy the right size. You can find them used -- though this is NOT the best time of year to shop for used tillers. (It's a great time of year to sell yours though!)

I would think the perfect tiller for that tractor is 5'. You want the smallest tiller that will cover your rear wheel tracks. 6' would be pushing it, so you're about "2 sizes" too big, in my opinion.

You wouldn’t need the tiller to cover tracks if you space rows.
A 4’ tiller would make one pass between the tires
then space out your next row so the rear tire is just at the previously tilled row’s edge.
This also creates a work path between rows.