This is a good solution as a substitute for the 1x4 plates outside the rails, for the purpose of keeping the track straight.
Having used jumpers and 2x3 inserts this way before
, for ballast on a curve, I'm already using the technique with jumpers, 2x3 plates and tiles along the track on my turntable. The advantage for a turntable is not so much to keep the track straight (as it's on straight frames already) but that the length of the turntable can be other than a multiple of 16M long. I've settled on 72M for now. 1x4 tiles bridge between the jumpers, each keeping a 2x3 plate in place, then other 1x4 tiles bridge between 2x3 plates, giving the offset plank effect. The tiles along the track substitute the function of the clips on the curved ballasted section in keeping the 2x3s in place. I took some pictures a couple of weeks ago so they will follow soon, though I might decide to hide the handrails!