Unfortunately I don't have an SPI interface, my Bluetooth module is this one :
http://www.gotronic.fr/art-module-bluetooth-grove-wls31746p-18950.htm
If you have a Bluetooth module with SPI interface, I could buy it... However since I will have to change the instructions given to the module and it took me some time to understand fully the one I currently use, I would prefer the new one to be well documented / easy to use.