Simply define the playfield sides as matrix, such as 2×130 (similar as you did the back matrix). No need to do any tricks, it will just work, as DOF will simply duplicate each pixel. That should be the fastest and easiest way.
Consider not to have an ongoing connection from each led strip to the next. Teensy allows to have 8 lines. The way it is done, it is faster to have 8×100, compared to 1 x800. And easier for debugging as well.
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