Is there any way to remesh just a specific area?

I have an existing flexible mesh which I have spent some time refining by hand beyond what the Mesh Generator originally produced.

Due to a new area of interest I would like to retriangulate one part of this mesh (at a higher resolution), but because of the time spent on refinement I would prefer not to retriangulate *all* of it.

I've noticed the "re-triangulate region" tool in the mesh generator, but this seems to only apply to a very small area (I think the elements that touch a specific node). Is there any way to re-triangulate a larger area, but not the whole domain?

Thanks.