Okay, the admins have discussed this issue and have made the following decision.
We are going to allow this as a one time only thing. Satomi may be used as your playable character; however, because this is technically your second playable OC to be admitted to HSV, you will NOT be allowed to have another one when/if she reaches the Chuunin level. We determined this is the fair thing to do because other returning members have gladly picked up where they left off with their former OC rather than getting a brand new one. If this second playable OC is sold, killed, leaves the village, etc (whatever the reason might be) you will not be allowed to create a third new OC. This second one will be the one to keep and no further changes/OCs will be permitted.
On that note, the admin team may consider allowing you another playable OC when/if we deem Satomi has been sufficiently grown as a character (not necessarily at a particular level, just grown to the point we believe she is going to be in the village for the long run).