If you replace two adjacent body parts with props they will become unwelded at the seam.

The way I would do this would be by editing the geometry declaration in the CR2 file.

In place of:-

actor rFoot:1
{
storageOffset 0 0 0
geomHandlerGeom 13 rFoot
}

You put:-

actor rFoot:1
storeageOffset 0 0 0
objFileGeom 0 0 :Runtime:Geometries:Your Directory:Your File.obj
}

Then just set the original toe invisible.

Other methods are available, parenting, conforming but if it were me I'd try this.... "just because" :)