Before starting, i did a fair chunk of interweb researching (a.k.a swimming through bullshit) and decided on a hybridised system....
First i drilled out the flow rim inner valve hole to 9.5mm. Then wrapped the rim in red 25mm effetto tape: installed the tyre and left it for an hour at 40psi. As you will no doubt imagine, it still had some bubbles under the tape when i removed the tyre and tube, but, like, whateva....
Next i added a stans flow strip (thanks just riding along!) and neatened it up....popped the tyre on, which inflated easily with my track pump. So, i deflated it, and whapped the circumference a la stans instructional video.
After spilling sealant all over the place i worked out the Effetto injector isnt valved, so got most of the rest of it - with about 5mm of pvc sheet filed into dust - into the tyre. The pvc dust should act as a clotting agent to allow the liquid to seal holes larger than pin pricks. With precisely 5% more than zero effort, i inflated it to 40 psi.
Initially there was a few hisses, but a lot less than i expected. With some funk on the stereo, i wobbled it around a la stans video again, turned it over, wiped with water and....
...... nothing - no hisses, no bubbling. So now i leave it on its side for a bit and maybe turn it over and see how we go eh?
I may need more sealant. I may need more pvc dust. Time will tell. More later.