You can base the rest roughing tool on the existing roughing tool, although it needs a smaller diameter and larger tip radius.
This example uses a 10 mm (3/8 inch) tip radiused tool.
The Lower Diameter automatically defaults to the Upper Diameter. This can be accepted for the current tool.
To see the rest roughing tool more clearly, click the light bulb icons for the roughing toolpath and tool, (toggle them to ). This undraws (but does not delete) the entities from the project.