I think the idea of breaking the original headlight is to save the outer ring with the mounting pivots and adjusting screw ear. Unless you buy an OEM headlight, you're not going to get one with that adjusting system on it.
That assumes of course that your headlight uses the top and bottom pivot with a side adjuster, most Honda ones do. Honda used 3 headlight sizes I think, one of which (on the 350-4, 400F, CB360, CB250 Nighthawk, etc) is an oddball size not generally available as an H4 unit. Yours may be this size (165mm?) or a more normal "car" size.
Anyway, this break-and cut plan assumes a metal reflector. If yours is all glass, you could still break the glass out and glue a standard sealed beam or H4 halogen bulb into the metal aiming ring. Or just glue a bulb into the main headlight ring. This is what I've done with an old Cibie H4 unit (the correct size for the 400F but without the aiming tabs, Cibie supplied a sheetmetal doughnut and some weird springs to do what the glue does). It works fine and I have no need to re-aim it side to side.