I don’t have any better options.
I find it staggeringly difficult to believe that the state of New York actively prohibits you from voting for conservatives downticket, while simultaneously either voting third party (as many FReepers routinely elect to do) or else leaving the top space blank altogether.
It may very well be, of course, that you do not find either of these alternatives preferable ones, for whatever reason(s). Your call, certainly; the only individual to whom you are in any way obliged, insofar as justifying your own ballot, is yourself.
What the more stridently ugly Team Juan partisans desperately need to come to grips with, here, is this: the exact same thing applies to each and every one of we dissenters to sour, red-faced Mr. Mexico, as well.
This is, as JimRob continually reminds everyone, a conservative board; not a de facto "Republican" one. No one here is in any way obligated to vote for, support, or even speak respectfully of any candidate the likes of Juan McCain, whether he's running with a large capital "R" after his name or otherwise.
Done, and done. ;)