I think you'll end up with a big bunch of broken parts in your hand. LOL
The whole purpose of the dual mode pedal is so you can switch it with your feet. I think the idea of converting your combo into a head may work fine, as long as the chassis is facing the same direction it does in the combo.
However, I think you'd be better off just using the amp and pedal separately, since there's a lot of things you're not accounting for. #1 grounding issues....if you combine the two pieces onto a front panel, you may create a ground loop that fries something, probably the pedal. Also, having sensitive pedal components next to a tube power section can wreak havoc.
On top of that, you'll want to figure out a way to switch the pedal's features externally, and you aren't an electronic engineer. Another thing is that it's pots and switches are probably mounted directly to it's board, so it wouldn't fit into your head chassis the way you want it to.
My advise....bring your Laney combo home, plug in your new pedal, and play it. You already learned the hard way from the cabinet experience, and from the tone of your posts about it, you could have just spent the same amount of effort and money on a factory cab. Just my 2 cents.