A low-wing / high-engine version would be closer to the a-10, but that is almost style over function imho.
Low-mounted wings also give the A-10 a very low stall speed, improving its ability to loiter over a battlefield.
It's all about tradeoffs.
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From wikipedia:
F/A 18-D 2 × General Electric F404-GE-402 turbofans
F-15 2 × Pratt & Whitney F100-PW-100 or −220 afterburning turbofans
F-22 2 × Pratt & Whitney F119-PW-100 turbofans with thrust vectoring in pitch-axis
F-35A 1 × Pratt & Whitney F135 afterburning turbofan
The strange thing is that at extreme speeds the SR71 engines were high-bypass, with most air bypassing the blades altogether to be burnt in the afterburner as a ramjet.
But jesus, the fact that lockheed made the SR in the 60 just freaking astounds me.
I can only imagine what they have been making these days for the breakaway civilization!