A panel-mount option I've used with the Shruthi are the 'T 113A' buttons which are widely availlable, cheap and come in different colours.
http://www.reichelt.de/Switches-Push-Buttons/T-113A-WS/3/index.html?;ACTION=3;LA=446;ARTICLE=45168;GROUPID=327…
Many congratulations!
I'd love to joint the pioneer run, but alas I cannot commit the time it deserves. However I will eagerly await the next batch.
Much success to you and thank you for developing this.
BTW has it a name yet?