I want to build a bartop cab to run this software:

the buttons to hold/cancel are 1,2,3,4,5 for each card. The others are enter, (D)eal, and (E) credit.
In real Video poker, they light up when you press to hold, then turn off if you press again for cancel.
Is there a way to do this?
I'd also like to know where I can get some square lighted buttons like this.
I'd like to save $ by doing a keyboard hack, but I think it's above my skill level so I'll be getting the cheapest encoder I can find.
I've been wanting a real video poker for years, but the great state of NJ says I can't own one. And, for some reason, the sellers on Ebay listen to NJ

This can be much cheaper anyway, so any suggestions appreciated. Thanks. Art