Your boy only needs neutering if you want to make him extremely happy and let him live with a sow companion of his choice. In this country, you also have the option to boar date at some good rescues for a character compatible boarfriend if you are worried about an operation. Birdie is still not yet halfway through his life.
There are a very few piggies that are not interested in others of their kind and a few that cannot get on with others and do better as next door company to other piggies, but the vast majority of piggies prefer to have company if you let them choose. You will never know what kind of piggy Birdie is unless you give him the choice at a place where you will only come home with a companion if there has been success.
We are following RSPCA recommendations when giving advice. It is of course up to you whether you want to consider it.
PS: Did you know that in Switzerland (where I am from) it is against the law to sell, keep or rehome single piggies? The law has been voted on and passed by the population.