I only know that it wont't explode until it is dry of water, but if it is similar to other explosives it will be stable in other solvents also. However I would never ever think of puting it in a boiling solution of ether even if just somewhere more than 30°C. Call me a coward, but my memory of Cu2C2 is that it makes a really big bum! But it is not at all as much so shock sensitive as NI3. And remember Cu2C2 is an exception as an organometalic since it is stable in protic solvents. There may be no need to use ether, DMF would probably disolve it (thoug it is more expensive).
Therefore I propose to use it only as a catalist. Not just for safety reasons, also for simplicity sake. And this could also help preventing dialkylation.