This is a great proposal. Our community is one where we silence spammers (even if 99.9% sure they are spammers) rather than delete.
I think it might be better to divorce the Akismet feedback from the action taken. On the Akismet notification, the options could be “Is this her profile spam: Yes/No/Not Sure”.
If the answer is No, then same as now: Akismet is trained that it got it wrong and no action is taken on the profile.
If the answer is Yes, the Akismet is trained that it got it right and the Mod is given options to Delete or Silence user.
If the answer is Not Sure, then Akismet is not trained either way and the Mod is given option to Delete, Silence or take no action on the profile.