Hobbyless Holiday

I hope the holiday treated all of you (well, the Americans, at least) well. Mine was ok, between long drives and a fussy, sick baby boy. Sleep is for the weak, apparently.

I wasn't able to squeeze in any hobbying over the long weekend, since I was away for Thursday and Friday, exhausted on Saturday, and my plans to airbrush on Sunday were altered when I realized I needed my skates sharpened for a hockey game that night. Oh well. Maybe Tuesday night instead.

I did finish reading Dan Abnett's Malleus over the break, and I have moved on to Hereticus. Malleus was good, but had a really floppy ending. The story is action packed and intriguing, but I felt like the last chapter and epilogue were completely phoned in. Eisenhorn spends the entire book (like 3-5 years of time) tracking down the Big Bad, only to defeat and resolve the conflict in six pages. I've often wondered at the editing processes of novel writers, and this notion that it's a lot like writing a movie or TV show. Half of what you intended gets left on the cutting room floor. I suspect there was a conversation that involved the editors saying "Great book, Dan, but it's 75 pages too long. Shorten the ending, please."

The more I read of the trilogy, the more I'm tempted to add a small Allies contingent to my army. I'd really like to add a single Inquisitor model and a small unit of Kasrkin models to my collection. I love the Kasrkin, both in models and in fluff.
Of course, I'm not sure how to implement that addition. I thought of three different options:

1) Run them out of Codex: Grey Knights. Inquisitor as HQ, Kasrkin as Henchmen Elites. This would require em to also run a Troops slot. I'd probably go for a 5-man Strike Squad, because Terminators are too pricey points-wise, and the Strike Squad brings Warp Quake to the board. Of course, I'd probably also want at least one transport, either for the Strike Squad or the Inquisitor. Another benefit here is that I can take a lot fewer Kasrkin models as Henchmen Warriors. The other options below require a full 10.
I flatly refuse to run Coteaz to make the Kasrkin Troops. it just doesn't fit with the reason I wanted to run them in the first place! I don't want big, in-game benefits for these guys. I just want the cool models on the board.

2) Run them out of Codex: IG. Inquisitor model is a Primaris Psyker, and the Kasrkin are IG Vets with lasguns. It's ok, but I'm not sold on the Primaris part. Yes, he brings Divination to the board, but again, I'm not in this for game benefits. Again, I'd probably need a transport.

3) Run them out of Codex: IG. Inquisitor model is a Commissar Lord, and the Kasrkin are IG Vets again. Less in-game benefit, and more wargear options for the HQ (though not as many as an actual Inquisitor).

I really can't decide which I like, though I like some aspect of them all. The IG options would also grant me access to a Valkyrie, which I've wanted to try painting since the final scene in THQ's Space Marine game. The Inquisitor shows up in a black-painted Valkyrie with =I= symbols on the wings. Very cool.

What would you do?