I've used these heated grips for two seasons all year round on my adventure trail bike, without any issues, so I've installed them on my t7, the lowest seating is hot enough for most days, the hottest is very hot
I've only used that setting in snow or ice cold winds, easy to install, controller has a mount, they velcro round the grips then they have a jack plug so can quickly be taken off if not used and stored in your back pack, the controller comes with a mount that goes on the bolt that on the mirror, three setting, I purchased them off aliexpress, cost is a very reasonable £12,
If you don't want to mess with your omd grips nice option
If you don't want to mess with your omd grips nice option