Inadvertently cancelling IFR flightplan

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… due to my sausage fingers I sometime click on ‘top key 3’ rather than on the F3 key to accelerate my Cessna Longitude. Is there anyway to send a message to ATC to have the IFR flight plan reinstated whilst still on the ground and during flight?

Nope. There isn’t. You have to re-request your IFR. That sucks even more if you’re in a small GA. Your FP may have been filed at 5000 feet. Once you request IFR clearance after accidentally cancelling, it will try to send you into the flight levels.