This morning I did it (with the great instructions of KF, thank you again!), I converted my LS to a Comanche and it came out great. Have a look:
The second tone pot is indeed a push/push pot and puts the pickup combinations 2 and 4 out of phase for a thin, shrill sound. All the rest seems to function like a normal Comanche. So the former LS (year 95 with 3-point neck mounting) sounds fantastic now, so much better than the three bass- & midrange voiced Kent Armstrong STHR-1 PUs (that are normally used only for bridge pimping anyway, so I have no idea why G&L put them in all three positions, it just does not make any sense soundwise).
The only flaw is the cracked corner of the pickguard, so maybe I will go for a new one, if it bugs me. Anyone out there with a nice cheap Comanche pickguard to sell, fitting the blueburst?