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I get what you're saying insofar as for a civilian love interest to work, the character would need some degree of civilian life themselves and John just doesn't have one anymore, nor does he really stay around Earth so it's just not practical to try and maintain that from a storyteller's perspective. Same reason Tora doesn't show up much when Guy's a focus-- how often are we on Earth? At most, a civilian love interest for a GL would feature at the start or end of an arc as a small moment but you can't have them contribute to the A-plot much of ever.
Lois and Linda can since while their significant others are powered and they aren't, they operate in the same space and can have a B-plot which feeds the hero's A-plot in some fashion.
I do feel a space-capable character is best for John because otherwise we won't get much interaction between them. It's why I don't think Vixen's a good match for him.