Something I tried in the past and it worked was to treat the prolif scape the same as layering a shrub. If the scape will bend without totally breaking, you can make it lay on the ground and put a rock behind the prolif to anchor it on the soil surface. Then the prolif can root while still being somewhat sustained by the parent. It only works with outside scapes that are leaning and where the prolif would "land" in a suitable place, although later it could be severed and moved once rooted.
