Per the latest Coop Supercard newsletter:
Haben Sie nicht genügend Punkte? Kein Problem, eine Zuzahlung per Kreditkarte ist möglich, Sie benötigen lediglich mindestens 2'000 Superpunkte pro Prämie.
So if you have at least 2000 points, you can e.g., buy the rest of the points and exchange to M&M miles for 0.02CHF/mile (5000 miles for 2000 Superpoints + 80 CHF). While not as cheap as the Coop Trophy deals (34.90CHF for 2000miles or 0.01745CHF/mile), it can still be a good way to at least top up your account for some specific redemption.