To be honest, with Keychain approaching $400K in DHF funding, third party auditing should be baked in, it is used by almost everyone and has ultimate access to keys.
According to a quick search on HiveSQL, we've received 111,561.960 HBD so far (+16k SBD before HF). I don't know how you got to 400k.
Our current funding is 9k/month, an external audit at the rates you've presented would have set us back several months in development at each release.
It’s on the third year of the proposal.