If some option allows infiltrators to bypass the academy altogether (because it is always strictly superior to academy training), then it's a buff for that class.
My claim is that the classes are balanced just fine right now. To make things fair again, you would have to add options that allow every other class to train up their skills faster than at the academy. Even if they take little to no risk, diplomats and priests are useless the first few weeks.
Infil risk is inherently risky as diplomat's is safe. Priests, however, totally depend on the context in which they operate.
