It's not going to be able to see anything at the closest approach that we can't see from earth. So there are no gains to be had, so no risks are worth it.
And even the 27Mkm number requires very optimistic assumptions, including that the main engine that has had huge problems during its mission would work perfectly for one continuous burn to exhaustion. Realistically, that's not going to happen.
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Juno's mission is at end-of-life at the proposal's starting point. So now tell me again about the risks.
It's not going to be able to see anything at the closest approach that we can't see from earth. So there are no gains to be had, so no risks are worth it.
And even the 27Mkm number requires very optimistic assumptions, including that the main engine that has had huge problems during its mission would work perfectly for one continuous burn to exhaustion. Realistically, that's not going to happen.