can be as simple as joining 2 wires and yes very safe if done properly and can be done so it cab be reversed if needed
the engineer you had out should have suggested it if it was possible
done lots for people who did not wanjt to pay a silly price for a clock
if you had a picture of the connections to the clocl i could probably tell you if its possible and which wires to join
if you need an engineer look here
https://www.ukwhitegoods.co.uk/search/find-an-appliance-engineer
you can ring one and ask for a quote to bridge the clock , it wont be even close to what you were prepared to pay for a newe clock unit
Dave