I'm cringing at the thought of ramping BTN Presses to your 1 rep max.. i think you're asking for some serious joint issues!
why not do BTN Pressing as an accessory to you inc bench day?
as for Lats/Biceps, CT usually advocated a day of 'bodybuilding' type work for them, as they respond better to fatigue, rather than performance training -check his HP Mass articles for a decent lat + bicep routine.
lastly, how much do you weigh? your thoughts on SGHP's 'overdeveloping the traps' will only be an issue if you already have developed traps.
IMO, SGHP's are the bread and butter of the layer system. yes they will develop traps which is welcomed by most, but they will also make your upper back thick, and your delts nice and wide! as well as building up the thighs, calves and forearms for a more 'manly' look which is coveted by the golden age look you describe.
if i were you, i would hit the layer system the way its meant to be done. enjoy the delt/back growth of the SGHP's until you are happy with the trap growth, then maybe consider changing it up.