Winterization of 2010 Elite V C4 with 5.0 L PCM Engine

[2010 Elite V Oldman WB SS 1]

Looking to winterize my 2010 Elite V C4 with 5.0L 305 cid PCM engine for the first time.  Has anyone winterized using a flush buddy or fake-a-lake device on the hull or does everyone just drain the water and pour antifreeze in through the highest hose in the system as shown in the manual.  Is there any advantage to either approach?  I would think if you use the flush buddy and Camco winterization kit, you would not have to drain the engine first since you would be forcing water through the system.

Since the engine is fuel injected, I was also wondering whether I could just spray fogging oil into the spark arrestor or whether I need to remove each plug and fog each cylinder.

Last question is whether it is sufficient to just replace the primary fuel filter or whether it is also necessary to replace the filter element inside the fuel control cell?

Appreciate andy assistance you can provide.