The chunk heel and platform are the most important features when searching for a suitable shoe. The rest can be modified. Color doesn't matter; focus on shape. Pleaser has a lot of shoes and frequently runs in large sizes, check out Snaz75.com for a huge selection. Several versions of their "Dolly" shoe can be modified quite easily.
Cutting the toe open (if needed)
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Adding glitter
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Shellac
Cover the shoes with multiple thin layers of a clear coat. This will minimize any further glitter shedding. The key word here is thin. If you spray too many layers too quickly, or too thickly, it will turn yellow and dull and pretty much ruin everything you've done.
Adding rhinestones
Use e6000 or any jewel-tack glue to apply the clear rhinestones to the heel.
Buckle
If you're lucky to find one on other shoes you've got it made. I haven't even had much luck on eBay or Etsy. You can at least paint the existing buckles silver (if they aren't already) and glue some tiny rhinestones on the top bar until something better comes along.
Heel covers
I've never experimented with heel covers (to consolidate the shoe change between Sweet T and the Lab Scene), but I've heard of some pretty clever solutions that seem to work well - and please feel free to add any tips in the comment section!