If it were me, I would search the web for an antique/salvage reseller and see if they had a pedestal that would match it first.
Where to Shop for Architectural Salvage - Old-House Online - Old-House Online
If you are going the DIY route, then I would try getting some form of backing behind the larger holes and fill in with a two part epoxy. Then use a kit like this for the final repair:
Porcelain Chip Repair