How do you change the AC frequency that comes out of the wall?
For a fairly limited power range and for certain loads, you can do it with things called inverters, which are designed to drive motors at variable speeds. Little ones, for say 500Watts cost about 200 USD
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I'm interested - can you drop a link?
Do you have a need for this?
You need to have enough capital to purchase your local utility company. Then you task the senior engineers to retune all of the generator turbines. Then you need to start a lobbying campaign (hire professionals!) to have all the other utilities in North America retune their generators as well.
See, no problem!