If you have oem sprockets, my advice would be to find a garage that has a air impact wrench and either a 27mm six point impact socket or a 1 1/16 impact socket. I have changed my sprocket to 16 tooth rubber dampened Kawasaki bought off ebay.You are at a disadvantage to attempt to change the front without the chain on. There are several threads and tricks to use on this forum, one method is to use a deep socket between the frame and one tooth.
The impact is required as any other method you are likely to round the nut, as you can't be in close enough to be at right angles to the nut.
What I did is remove speed sensor, carefully un-crimp the lock washer, put it in sixth gear, pushed the bike backwards so the chain was tight,block the rear wheel,
used air impact at 120 PSI, 5 seconds it was off.
As to changing just the rear, if the chain failed due to sprocket wear, it will fail again, possibly within 2000KM. If 2000km gets you home then go for it BTW, the proper chain requires a riveting tool, not a master link, without the proper tool, a master link will work, but typically what happened to you, typically is associated with sprocket wear and a master link being used.