Has anyone ever seen or even heard of this anime:

It would be interesting to read a Spike harem story where he not only pilots a mech but also combines it with any of his potential harem mates' as well.

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Very interesting idea, Mechazilla8.

So, essentially it would be sorta Voltron: Harem Edition?

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I have years ago. It's like a SOAP Opera in Space

Yeah I've seen it Vandread was pretty interesting because men and women were separated from each other and the MC was pretty much an idiot at times but basically humans had messed up earth so bad that they seeded life on other planets so that they could have replacement body parts and would use technology to go to those planets to harvest the lifeforms. But MC and crew decided to fight back.