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Or you could set up a puppet company in Hungary for the purposes of selling pagers to your enemies, install the charges during production, and bide your time.
How many innocent people were hurt physically by this stunt? How many more were given severe mental injuries from seeing someone explode while going about their happy normal lives? Israel isn’t helping their reputation or their standing as an innocent party in a rough neighbourhood.
If it were me I'd get hold of the 1k pagers, modify them, then work out a way to get that shipment of pagers to Hezbollah.
That way your risk in the chain is limited to the swapping shipment step. Doing some sort of factory based modification seems fraught with risks of being uncovered.