Benvenuto, Pocosso!!!
Thats what I was thinking - you don't have to polish it to a high gloss, and it will protect the metal better than any surface coating (paint, wax, etc.). Honestly, while you like the patina, you will be fighting flash rust issues forever - Nickel stops that dead.
I battle that rust here (central Umbria) so living on the water it can only be worse...
You can set up an electro tank from a round 20L bucket or a squared rectangular plastic tank from Leroy or Brico... and a power supply or old style (non automatic) battery charger... You can get the electrodes and solutions on line (
https://www.tifoo.de/en/nickel-plating-solution-1000-ml) and do it yourself... small scale, it's relatively easy. (And they ship from Germany to Italy)... There are SEVERAL youtube videos showing how to do it, I was surprised just how simple it is!
Anyway, good luck on your restoration, so far it looks great!!