So showing an Immigration Officer a ticket you have no intention of using when asked about how long you intend to stay is not "fraud"? Same same but different maybe.
if you mean frozen by the bank for 4 months surely that's not an issue as the conditions for getting a 12 month extension requires the balance to be 800k for 5 months
If you get your Non-O from inside Thailand then it is usual for you to get your first 12 month extension from the same Immigration Office. This does not apply to an Embassy issued Non-O.