Due to millennia of strict breeding and small genetic diversity, Mandalorians who are sensitive to the Force are exceedingly rare. This presents itself in the following ways.
When determining if the Mandalorian character is Force Sensitive at character creation, have the player roll 1D, on a roll of 1-4, the character is not Force Sensitive, on a roll of 5-6 the character is Force Sensitive, but starts with 0D in any Force skills.
The Character must spend 20cp each to unlock 1D in each of the Force Attributes, this also takes one month's in-game time (70% of free time spent training) per Attribute.
The Character must raise each Force Attribute to 1D before beginning their training as normal with the exception that advancement costs 2x the normal character point count, (1D to 1D+1 = 2cp rather than 1cp). This represents the difficulty that the Mandalorian people have accessing the Force