I had a bit of result today. I decided to buy some Stan's No-tubes sealant as the KTM came with some tubeless valves and the Schwalbe Ones are tubeless tyre. Upon pealing the tires and tube off, I found the Spline 23 wheels were already rim taped, so I stuck the valves in, the tyre mostly on, poured in the obligatory 100ml of goo and pumped them up. I didn't even have to remove the valve core and it all seated and sealed first time with virtually no mess. I even found a tiny puncture in the tyre that of course, sealed immediately. The moral of this lesson? Just because there are threads of doom and gloom with much gnashing of teeth about going tubeless, it ain't always like that!