Absolutely correct Zomp.
Even if you get the "so you're telling me you won't go into discretion" pressure from the SMNC (who all have an expectation BTW, for you to use discretion), or the "I'll put us on a conference call with TCAS & BM"; don't buckle.
Get another FO or go home. You've got another two pilots who should be backing you up on this.
Remember it's called "CAPTAIN'S DISCRETION" for a reason. LL will back you on this. No one else has the responsibility to go into discretion apart from you. If you F$$K up because you have, do you really think the management will back you up?
I'll leave that answer open.........