Eh, I fear this might sound more, uhm..contentious...than I intend But I`d worry about unnecessary thinning of the clearcoat. Yeah, even with M205 (the TSO in which drive me nuts, so I`d never use that before a coating anyhow).
Noting that I`ve done that plenty of times, I would *not* polish through the existing LSP when it`s easy enough to simply wipe, or "wash", the residual LSP off with the right Prep Product. Even just wiping it with Mineral Spirits oughta do the job, then a *NON*abrasive Pre-coating Product should work, and IMO it`d even be faster/easier than polishing a whole vehicle.
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