I know there are some who push "you have to have these grips" and such. B.S. The only thing you need Oxford wise is a pair of shoes to get laughed at when you wear them on your bike.
Don't overthink it. $30 bucks, maybe less, maybe more. Go to ebay motors and look for a grip kit that uses the elements under your existing grips....if you can get them off without cutting. Install the sticky back heaters, put grips back on. Pretty simple. Left will be a bit cooler than the right due to no plastic twist grip insulating the heater but, TADT (they all do that). To not have the left side cooler, you change the left bar by gluing a twist grip onto the bar, grip heater on the plastic, and then putting on two right side grips for each side. Gets a bit more expensive that way.
For 10 to 15 minute duration commute, most people will find that you're good with just grip heaters unless it is just too cold for them....everyone is different though. Longer durations bring in other factors that are more individual and bike/environment dependent. As the last guy said, you can always double dip and add warmer gloves to make it easier to take a leak when you get to work.
R1200RT (R1100RT gone)
KLR650 - gone
Don't be the guy who needs to pee on the fence to figure out that it's electrified.