That's a sad tale. The crank seal however should not be failing so regularly. Either the fitter has not got a clue or there is another problem - worn bearing maybe? Use a heavy lever against the crank pulley to see if there is any free play. Obviously there should not be any.

Something like this might be a better option.
https://www.ebay.co.uk/itm/FIAT-PAN...777524?hash=item4213aa6c74:g:2m4AAOSwQ8VeWAi1