Basically NoFail but with a limit, or Easy without the difficulty-decrease.
You can use Revive with Sudden_Death and Perfect, which will allow you to miss 'x' times or hit 'x' 100s, depending on the amount of revives (max of 3 seems reasonable).
Should probably be Unranked.
Or maybe have something like a setting on sudden_death/perfect, giving you an option on how many misses/100s/50s are allowed, just to get that 'nothing less, only more', and not the 'SS or nothing'
Perhaps this could be implemented as a setting of the easy and sudden death mods.
Referencing #6272 for usage. (Going with the setting way)
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Perhaps this could be implemented as a setting of the easy and sudden death mods.