Upgrade MK111 Front Mastercylinder

Someone backed into my MK111 Commando knock it over and snapped my front Master Cylinder Assembly. Was planning to have it upgraded anyway to the 13mm by Old Britts. Problem is the existing one is not salvageable. Andover wants about $500 for their conversion. Any suggestions for a most cost affective one.

Master cylinder from a Triumph T140 E goes straight on, and also has an alloy lever.
sam

One would think that with so many brake upgrades having been done that someone has a core. Perhaps a wanted posting is in order.

My kid has a T140E and I noticed the master cylinder would fit the switch gear and considered that it would be a way to install a 13mm cylinder. In the end I think sleeving an original will work out better for me.