would exhaust all outstanding buy offers in CCEDK
Yes it would temporarily on CCDEK, which is not
an authority on FIMK market rates (there's no such yet, but you sure can consider CCDEK rates the most indicative)
exchange rate would drop to zero
That's a misleading statement. Actually FIMK is in such a good position that its exchange rate can't drop to zero (illiquid) for any longer than a short period. If no one else, the association would take care of that at some lingering price point. Need to get rid of 50 million FIMK? No problem, you don't need to give it away. We'll pay cold hard cash of Bitcoin or EUR for it (not talking about the rates now
Blasting the buy offers away has a temporary washout effect, just like CCEDK's periodic offer removal bugs do. Rates are quickly replenished. Repeat blasts certainly have a declining effect on thin / single exchanger markets. However it doesn't destroy the real life usability of FIMK which per se
is not dependent on the exchange rate.
By all means, try to buy your $100 grocery basket by liquidating FIMK on CCEDK and see what happens. It's no crime