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.

Doc-take it easy John this is just a sharp scalpel. It will not cut deep so don't worry.
Me-I'm not John
Doc-I know, I am!

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