Small bikes have steeper down tubes. Given an off-the-shelf lost wax cast, tight fitting BB shell and lower HT lug, how are you supposed to modify them?

Cut them away on the inside of where you are bending them to, and bend to close the gap, then silver solder?
Cut them away on the outside of the bending direction and fill with brass, then file inside and out?
Cut away at the side, split the side and bend both halves, then solder?
Cut them away entirely and replace with a piece of mitered tubing and brass?
Refuse to build frames for anyone under 5'8"?