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When I testing, I start with 01 and just increment the number as I go along. This way when I happy with the design, my "permanent" keyvault name is not taken. You can also purge the vault via CLI or PowerShell. https://docs.microsoft.com/en-us/azure/key-vault/general/key-vault-recovery?tabs=azure-powershell#key-vault-powershell

It would be ideal for there to be a delete option in azure-native that includes purging. Purging is a first-class component of the API. App Configs are in the same boat. I've played around with the Local Command package, but there are quirks with it (e.g. it only seems to get registered during a pulumi up, not during a destroy). So I've been running the Az CLI after a destroy, e.g.:

((az keyvault list-deleted) | ConvertFrom-Json) | % { az keyvault purge --name $_.name --location $_.properties.location };
((az appconfig list-deleted) | ConvertFrom-Json) | % { az appconfig purge --name $_.name --location $_.location --yes };