I currently have muffs fitted for winter so a doubt I'll get a decent photo sorry.
No need to change any lines or cables.
Use a fat bar conversion with rox risers, dump the bar weights (if your 1150 vibrates then there's something wrong with it). But you can always fill the bars with silicone.
IMO unless you find a fixed riser that suits you the rox allows infinite adjustment.
Bit the bullet and rip the BMW grips out, a set of 2 stage hot grips cost £40 and are better than oem.
With a bit of tinkering Ktm hanguards will fit as well.
I've have 1150s for 18 years and ride a bike almost every day of my life so was trying work out why I could never be as comfortable on my GS as on a big Ktm, it's the bars apart from being too wide, wrong bend for wrists they also look rediculous