Revisiting an old topic... The F800 forum doesn't seem to have as many DIYers as BMWSportTouring, so I'm asking here. On an F-bike (maybe newer R-bikes, I don't know) the entire grip assembly appears to be a bolt-on affair. I don't like the profile or hardness of the stock grips, and I'm thinking of replacing with something softer. Does the same procedure (carefully slice, then peel old grip without cutting completely through) apply for an F-bike?
If you don't like the stock grip you might first try either a full Grip-Puppy or a partial Grip-Puppy. You can cut a stock Grip-Puppy in half or even use a quarter then install with the tapered end towards mid grip (I do the 1/4 grip-puppy on some of my bikes that I don't like the stock grips &, for me, it really improves the hand fit & comfort.
If your 800 doesn't have heated grips then you should be able to get the stock grips off without cutting. You should be able to work a long small diameter screwdriver between the grip rubber & inner plastic sleeve then work it around to break the glue free (might also need to use a little WD-40). I usually use compressed air to blow the grip glue interface free once I get a spot opened up using a screwdriver.
At least try removing the stock grips without cutting as the stock rubbers are not available from BMW (at least they weren't anyhow) without buying the entire inner tube with outer rubber already on it (expensive).
You can remove the entire throttle twist grip tube with little effort then you can work on it on the bench (or soak in hot water).
The clutch side tube is also removable but you first need to unplug then remove the entire switch assembly from the bar then once the tube/switch is removed unclip the outer tube from the switch assembly.