How can I use a second keyboard as a Soundboard on Windows (remapping keyboard)?

I want have some Sound Effects ready if I'm on Discord or something, but don't have enough keys on my keyboard. So my idea was to use a second keyboard and map the Sounds in Soundpad to my second keyboard. The problem is, that the second keyboard will only be recognized as a normal keyboard and if I map i.e Ctrl+A for a Sound in Soundpad, it will also be played if I press Ctrl+A on my main (gaming) keyboard.

Any idea how to do this? I use Windows 10 Pro.

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