This tool should work well with any usb or bluetooth foot pedal that imitates a keyboard. The examples below are a tiny subset of the commercially available and DIY buildable options out there, but they should give you somewhere to start looking.
If you are using this tool on Android, you may be able to connect a USB foot pedal to your device with a USB: On the Go (USB:OTG) adapter. These adapters often cost less than $5. Otherwise, the bluetooth option is much more convenient, but pricy.