Has anyone had any experience using SAMSUNG devices with MobileIron?

We're deploying to some mid-range samsungs and hitting a problem. Our security policy (defined in MobileIron) requires a 5 character password, no complexity requirements. On other android handsets, iOS handsets etc this isn't a problem and we can set a 5 NUMBER passcode. 

The samsungs however, require a password containing at least one letter - and setting a PIN is not the same as setting a password. Without setting a password the device never becomes compliant.

Reading it seems the letter in a password thing is Samsung specific - has anyone found this and come up with a workaround?

Issue is mainly having to enter a password on teeny tiny on screen keyboard vs a PIN on a larger numpad.