Calm down, everyone, the sky is not falling. 

Have you asked the issuer why they decided on a NEC instead of a MISC, and politely suggested that in the interest of good company relations they correct it to the right form?

Yes, it is a SPIF, and not subject to SE tax or FICA tax.  By the way, they probably outsourced the trip to some travel agent that charged the buyer $7,500 but booked the whole trip for $4,500.  Clients should have done some research at the time, to figure out how much it really cost.  

We don't really know what IRS is doing when NEC is used for MISC income, because the NEC hasn't been around that long.  Yes, it's similar to using the wrong box when we only had the MISC.  

Are they sending CP2000's next year to people who might owe $1,000 in SE tax?  We don't know, the guy who makes those decisions hasn't been confirmed by the Senate yet.  Last time I had a case like yours, clients won a door prize (not employment related), got a 1099 for $2,500, paid tax on $1,500 because that was the FMV of the trip, attached a statement to the return explaining what happened, got an IRS notice anyway.  We sent back a copy of the return attachment, and the case was closed with no adjustment.  Your results may vary, but remember your job is to prepare a complete and accurate return.  Not to play trick the computer, when they didn't even invite you along.