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Here are a couple of good articles that include powered attic venting:
https://www.greenbuildingadvisor.com/article/fans-in-the-attic-do-they-help-or-do-they-hurt
https://www.greenbuildingadvisor.com/article/all-about-attic-venting
Generally speaking, in most cases, they hurt more than they help. It's usually better to air-seal the connection between attic and living space and add more insulation to the attic floor.
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If you oversize the ridge vent compared to the soffit vents, or don't use soffit vents at all, or you use a powered vent, unless your ceiling air barrier is perfect, you will draw air from inside the home.
An option I don't see is not involving the attic at all -- just having the fan in the living space somewhere and venting directly outside.
I love whole house fans, but the challenge is how to seal them when they're not in use.
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There isn't an out of the box solution that does what you want, it's going to require some construction.
The one on my last house was great about 15 days a year but it was so noisy the wife would not tolerate it even when it was ideal conditions. The rest of the year it was a leaky uninsulated hole in the ceiling I think is lost way more energy than it ever saved.
Consider ducting it to a set of louvers on the gable end wall.
Walta
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Much like the install shown on this website but with a duct in the attic so all the air comes up from the ceiling.
https://www.protoolreviews.com/how-to-install-commercial-wall-exhaust-fan/
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