OK Doug,

Since you made the statement; "Except for being used for a spare Back
Stay the Rigid Vang can do everything that a topping lift can do."

It's turned into a yes it can, no it can't.
So, let's change it to; A Topping Lift can be used as a Hoisting Device
even without the "BOOM".

Now, can the solid vang do that without modification?

Ole Thom