What voltage? AC or DC?
That's nuts. Run both magnets at the same time on half the current (or use a magnet that can handle the load continuously).
What do you call "breaking the bank"? How can we advise if you don't specify?
Are you sure about that? Two magnets each contributing half the normal force, when either one of them can do the job on its own...
Transistors are current driven. To gate 75A you would need to provide a base current in the scale of amps. I don't think I have ever seen a 75A transistor. Power electronics uses MOSFETs (which are voltage driven, but power MOSFETs also have large gate capacitance to deal with). You can't just cobble this sort of thing together successfully without a great deal of study, and I'm not prepared to put in that much effort on your behalf. Buy ready made.
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