Afaik, something like this would not be guaranteed to be accurate for many cases (i.e. where plug-ins do not output 100% predictable results; think of randomness and noise in electronic circuit models, free-running oscillators, etc.), and may thus end up as a sort of 'rough estimate'. Unless you manually verify each and every plug-in, the only way to really be sure, is to actually render and keep the result.
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