Hey kettle, you're black!

Actually, I always seem to read about epoxy and I see your sig with the duct tape. I recall reading something about you epoxying and having to open all orifices in the house to clear the stink out....don't remember all of it, but had a good laugh picturing you gettin' all loopy from the fumes! LOL
nerd, if you're not comfortable with a router, then take the adhesive method (or if you're allergic to work like stingray

) because not only can you screw it up, but you might even take a whack at killing yourself.
I actually hate using a router to do that slot, and quit doing it that way. I use a biscuit cutter to do it, instead, as it's got a plate to fold down against your workpiece and makes it almost fool-proof (unless you're adetermined fool) as there's no skill needed to do it that way. Set it up, test on a piece of scrap, fine-tune if necessary, and fire away when dead-on.
If you have a router, get a router table. Use this in the same fashion.
Less work IS preferable, but if there's already a gaping chasm to put your T-molding in, I'm pretty confident that you'll find it hard to get a satisfactory result with just using adhesive.
I can't see your cab, so I'm going on your description, and I picture you having to glob so much adhesive in there to keep it 1)in place, 2)centered, and 3)neat/clean.
If all else fails, slap a 350 with some headers in there, 4 barrel carb and....whoops, sorry Al.