Glad you like a few of my ideas :)

The suggestions a) to d) are of hypothetical nature. I mentioned them in order to display a more typical approach how one could create additional incentive with a more currency-based approach. I don't think these are viable though, at least not in the near future - but it's not wrong to think about such options either.

In the last part I focus on a less currency-based approach (1-5), something that I would prefer to see implemented, because it generates incentive based on actual interest for science and the BOINC/GRC collaboration - imho a long-term solution that is independent from the currency and hardly influenced by future crypto development, especially market crashes, etc.