I'm not Bob Carnie, but I've done a bit of this on Fomapan 100 (though not using the solarization developer). In general, I find it's easier to get a strong effect with a more active developer.

What's worked for me is to tray develop normally, flash the room lights at the midpoint of development, then finish the normal development time but without agitation. For me the lights generally need to be on for a second or two, but obviously the time varies depending on the strength of your lights and so on. Too short and the effect is minimal, too much and it just produces a low-contrast reversal with a lot of fog; in between is the sweet spot with some of the negative reversed and strong edge effects.

I don't think it can easily be made into a predictable process, which IMHO is much of the fun...

-NT