SEP-IRA W-2 conflict for self-employed

OK, a bit of a challenge for you experts.

 

I'm self-employed. I have been for years. I have not been employed by the company that issued me a one time NQSO distribution via W-2 for several years.  They did withhold FICA though. As I am self-employed (sole proprietor) and there is no reasonable definition of employee that applies to me, I think I should be able to make a SEP-IRA contribution as my own employer using the W-2 income.  It makes little sense to me that the company's mechanism of distribution would define my employment status. 

 

When I use the Adjusting Self Employment Income mechanism (in the Self-Employed Retirement Section under Income/Expenses) and enter my W-2 amount in the Your Non-Farm Adjusted box my proposed SEP contribution applies perfectly. 

 

Is this permissible? Or am I sending up a giant audit flag? 

 

Thanks so much for your insight.  Any alternative solutions would also be appreciated.