Setting options of object after defining it

Question

Is it possible to edit the options of an object like Plot or Graphics after I store it as a variable?

For example, consider the following Voronoi mesh

VoronoiMesh[RandomReal[1, {5, 2}],
 ImageSize -> Medium,
 Epilog -> 
  Inset[Framed[Column[{BarLegend["Rainbow"]}, Alignment -> Center], 
    Background -> White], {Right, Bottom}, {Right, Bottom}]]

Now, if I set

mesh = VoronoiMesh[RandomReal[1, {5, 2}]];

My goal is to "edit" the object mesh and include the two options for ImageSize and Epilog

ImageSize -> Medium,
Epilog -> 
 Inset[Framed[Column[{BarLegend["Rainbow"]}, Alignment -> Center], 
   Background -> White], {Right, Bottom}, {Right, Bottom}]

I have tried something with SetOptions and SetProperty, but nothing seems to work. Something like

SetOptions[mesh,
 ImageSize -> Medium,
 Epilog -> 
  Inset[Framed[Column[{BarLegend["Rainbow"]}, Alignment -> Center], 
    Background -> White], {Right, Bottom}, {Right, Bottom}]]

Any ideas?

Answer 1

Since the output of VoronoiMesh is a MeshRegion, use MeshRegion to change options. An example mesh:

SeedRandom[1]
mesh = VoronoiMesh[RandomReal[1, {5, 2}]]

Using MeshRegion to change options:

MeshRegion[mesh,
    ImageSize -> Medium,
    Epilog -> Inset[
        Framed[Column[{BarLegend["Rainbow"]},Alignment->Center],Background->White],
        {Right,Bottom},
        {Right,Bottom}
    ]
]