I'll try it as it is first since there were no obvious leaks, but can always pick up some sealant over the weekend.
Thanks again for the tips!
I tried using tubeless without sealant and, while there seemed to be no detectable leaks, I found that I was still pumping the tyres up every other day. The sealant made them stay at pressure for longer.
It's also a myth that tubeless tyres are lighter than standard ones. They have to have thicker sidewalls for strength so what you lose on the inner tube you gain on the tyre. The only advantages that tubeless give you are resistance to pinch flats and the ability to run much lower pressures. Other than that there's no reason to use them.
My Kenda tyre and tube combination is lighter than the lightest tubeless tyre anyway.