I have been fitting grips recently on all three bikes ..... mine and the wife's.Firstly
check the fuse rating of the heating grip connector circuit that is provided in the loom. Oxford grip draw about 4Amp, the Sport circuit is fused at 10A.. It would be preferable to use the provided circuit, it will be neater than having to run back to the battery .Secondly
get a set of instructions for the version of grips that you have so that you can determine what the 3 connections are for. 12V, Gnd and a switched feed (maybe) ... don't guess! double check before you start!! It will save wasted effort and tears
The Sport harness\loom connector provides a fused feed and a switched live ... I used it to energise a relay, the relay switches the fused feed to the grips. I am not sure about the 1050 and I am not at home to check my Haynes manual. Do you have an manual\wiring diagram?
If you do happen to pursue\purchase the new type they do have a Auto Off function which allows them to be wired directly to the battery however you can disable the function (I have on all 3 bikes) and allow the relay\ignition to control the On\Off status.
I hope that helps for now, I'm happy to help more if needs be.