I can say that it probably wont work. I put 1" straight risers on and did the 3/4" fork drop and at full lock the brake line is pulled as far as I am comfortable with. Its ok now but i wouldnt go any farther with it. As is, i pushed the bars a tiny bit forward to give a little extra slack. Let me know if you get it to work otherwise. It sounds like some cable rerouting can be done for some extra slack but i didnt try it.
So, I think I "read-in" to your reply that you did not perform any cable re-routing? If that's true, then, in my opinion, you left quite a bit of brake line "on the table". I removed the top line from it's clips and freed-up at least an inch of line, without dropping the front fork tubes.
All I did was remove the brake line from the clips that keep it from moving and I obtained a bunch (well, at least an inch) of additional slack. I checked and re-checked the lock-to-lock performance in that state (with left turn being the worst case), and saw nothing that gave me pause about using that now available slack.
So, that's why the question is here. I'm thinking, right now, I've got ~3/4 inch, at minimum, of slack. Add the "extra" 1 inch from releasing the cables from their clips, drop the fork tubes 1/2 an inch, voila! 1/4 inch to spare as a WAG.
You've all probably already guessed I'm gonna try this. I am pondering the steering geometry change carefully, tho. What I read is that good, careful folks (like you
drop the front end a bit (3/4 inch in your example), make no change to the "back end" via lowering link, and ride on with no problems (unless they show up in "coffin corner" cases, like from high speed wind buffet on a scored-for-rain road surface and catch unawares until too late)...
*That's* the scenario that really gives me pause to think this through. I'm cheap, but not that cheap! If I decide it's too dice, I'll either: buy the whole brake line kit, 2) buy the single brake line (which I have confirmed today that I can get) or 3) buy the lowering link for the rear.
Anyway, I'm grateful for your input. Thanks...