That sounds reasonable. The Tilix valve uses a vacuum source to control a valve that operates the vanes. This valve is a variable one (adjust the pressure applied to the spring inside by turning the valve body), so you could adjust it for varying boost levels. Once the pressure inside the manifold reaches the desired limit (you have to put a connector to the manifold just outside the turbocharger and run a vac line from this to the Tilix valve), the valve operates and backs off the vacuum from the actuator.
So in the end, you only need one vacuum hose from somewhere and you put the rest together from the valve's instructions. In those instructions, you'll see reference to the vacuum hose that comes across the top of the D40's engine - this is the vacuum source, the D40 vacuum pump is on the right hand side of the motor. The BCS is on the left hand side up the front (bolted to the intercooler hard pipe), the instructions will refer to that and tell you to disconnect this and that - don't worry, you only need that first vac hose and go from there.