For some users, Bullet might be a perfect solution for log-in and work with what's there. It is not, however, suitable for non profits at all. There are no non profit specific account types available (like temporary or permanently restricted assets).
You can create new accounts, or rename some of the existing ones, but their interface doesn't even tell you which accounts are system accounts, and which are not.
Because "workflows". According to Peter Connor (who responded to me via help chat) customers mucking about with customization screw up the workflows built into the system. The workflows may be fine for the for-profit business sector. They are non-existent for non-profits. After being told he'd wasted 40 minutes of his time for nothing, I told him to delete the account.
If Bullet ever comes out with a non-profit module, or a "Bullet For Non Profits" I might try it again. but until then? Bullet Accounting is a HUGE no!