Yeah you can add the archon to the cast of players, and yes, I grand spectre can replace any death jester.
I've not really used troupes personal perference is the Faiulchu? Blade detachment, but I would drop one or two of the caress and give one to the troupe master. Means you've more bodies as extra wounds before you loss one of the upgrades and the masters extra attack give the caress more chnace to do damage.
I would toss haywire grenades on the archon if he's going with the troupe, though a succubus might be a better fit I've found she does far better in assault than the archon and her ap2 is invaluable at times. Shadowfield my be worth a shout.
I'm not really sold on the solitaire, he's rarely made an impact for me, but then that's probably my inability to roll dice at times.
Not a fan of the syrabite with Haywire grenades but I've seen a few people mention heir pretty good, I've never had my warriors that close that they would use them so I've never taken them.
I would split the reavers in to 6x3 instead of 2x6, again it's personal preference either way, I just find that 3man squads are easier to hide and more useful in general spamming msu.
You do lack anti armour though which will be interesting but looks like a fun list