Yes, they require EZKeys. Just wait for a sale. I have picked up a few EZKeys for around $50-$70 USD when they were on sale.

But you only need one EZKey to run all of the MIDI. There are a number of simple piano styles included in the following EZKey's MIDI:
Big Band
Classic Soul
Contemporary R&B
Emotional Ballads
And many others. I also purchase them only when they are on sale.

They are found under Variations 01.

You can take an EZKey MIDI, drag it to your DAW, and use it with a BiaB style. I have done this a few times. You may be able to use EZKeys in BiaB but someone else will have to verify that as I don't that kind of thing in BiaB.

I am really impressed with EZKey MIDI.

My goal this weekend is to move just enough each day so that no one pokes me to see if I'm dead or not.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware