Since John does not seem to like the idea of his mother choosing a spouse for him perhaps he could find a foster mother (one who already knows his tastes and might select a suitable mate).

There are people that do nothing but find mates for a fee. Although I would not suggest he go this route, it is a possibility.

The best we can do as loyal Ponavarians is to set him up with all the possible mates we might know. Or just wish him good luck.