If you want reliabilty then I belive you have to stick you neck out and go for a modern 3.5hp 4stroke such as the Tohatsu or Mariner, same product.
Fairweather Marine at Fareham will do one for £410 not a lot of money when you have the safety of your family to consider 🙄 . Seagulls were good in their day but belive me they don’t go on for ever, things move on.