I'm running a comparable rig to the OP. There are three "fuels" you can burn:
- Road legal diesel aka "white" diesel. If you are running a leisure craft then technically this is what they want you to run.
- Red diesel for plant use - low sulphur content - you will be offered this at marinas and fishing quays - but expected to declare usage and pay the tax element as discussed above.
- Red diesel for heating - sometimes called Marked Gas Oil and frequently has a highish sulphur content.
You can't successfully run a modern diesel on kero - as Alan says it has lower lubricity than diesel and has a lower energy release. Diesel fuel pumps are lubricated by the diesel
I carry fuel to mine in 25l drums. With a 450L+ tank, I can generally manage with top-ups of 4-6 cans a day which slowly replenishes fuel used on multi-day trips. You might consider a storage tank somewhere and bulk buy low sulphur MGO. If you are purely leisure, a few fills a year from the marina will be good for the "optics".
If you DO store your own fuel - consider adding diesel bug treatment before each delivery and keep an eye on the "dregs" in the cans after filling.