If you think of {Gimp, Inkscape} as a toolset, your problem is gone. Especially if when you clic "edit" on your linked shape Inkscape opens automatically: then

If you think of {Gimp, Inkscape} as a toolset, your problem is gone. Especially if when you clic "edit" on your linked shape Inkscape opens automatically: then the frontier between the two is as thin as the frontier between Grep and Sed when you use them together through Bash. Drawing geometric shapes is inherently vectorial. Not Gimp's purpose.