$100 Bounty for Hot-switch of host computer for Massdrop Ctrl

[GreyAsteroid]

This bounty is related to #10025 and #5185 but specifically for the Ctrl keyboard as that is the qualifying keyboard I own.

I'd like to be able to switch between the hosts plugged into the keyboard with a keypress.

The bounty is payable via PayPal. Conditions are that this feature is merged into QMK and I'm personally able to verify its functionality.

[fauxpark]

See #11119

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[stale]

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