You'd best think that over again...........hard.
You will have no frame left on the Honda before you are done. The Triumph engine hangs from its' frame and there are zero front downtubes on it and no mounts on engine at all at front or bottom to fit into the Honda frame. The Honda frame will be way too narrow at the top runs too, the Triumph one is a perimeter one that goes around the induction so all top horizontal tubing is in the way as well. The engine becomes a stressed part of the frame and it must hook up to the frame that is left with very tight precision to not start breaking engine castings when the frame is too loose or weak to then flex and it carries into the engine.
Maximum disaster waiting there if you ask me. It's like you picked the hardest thing you could do. You will be making a complete new bike up out of thin air with nothing easy about any of it. Some like that though, fewer succeed. The mech will have to have design fabrication and welding skills of the highest order. Who's going to pay for all that?
Far easier to find a 900, 1000, or 1100 DOHC to drop right in with way fewer mods.
Yours and do with it what you will.