I have the perfect stand for small keyboards. It's an old Quik Lok model that was designed as a display stand but is perfect for live use with small keyboards like the KB37. It was discontinued several years ago but it seems you might still be able to get one. Here is a link - http://www.proaudiosuppliers.com/quiklok-ams-ql-690-r2.html

Alternatively, and this looks like it could be really good, Quik Lok have a new model, the SL 820, which has an accessory bolt-on laptop shelf with a small mouse shelf [SL 825] that hangs off the side of it. It looks like it could be close to perfect for your needs Musician's Friend have the stand for $149 and the shelf for $69, which sounds like reasonable value. I think I could be talked into that set-up, if I can get them all the way down here in Sydney. The local distributor doesn't have them listed, but that doesn't mean much.

http://accessories.musiciansfriend.com/product/QuikLok-SL820-2Tier-Fully-Adjustable-Keyboard-Stand?sku=424025

http://accessories.musiciansfriend.com/product/QuikLok-SL825-Laptop-Holder-For-SL820?sku=424023