Can I use a 1x10 wide range cassette with Shimano SL-BS79 bar end shifters? I'm putting together a drop bar hybrid conversion for a gravel bike and want to run a 1x10 drivetrain. So far the only shifting component I have is a pair of Shimano Dura-Ace sl-bs79 10 speed bar end shifters. I'm planning to just use the rear one, obviously. 

Before I go ahead and buy a RD and cassette, I though I would check for any compatibility issues. I guess that the shifters are intended to work with road RDs, whereas I guess that I'll be wanting a MTB RD to deal with whatever wide range cassette I end up getting. 

Any suggestions? 

Edit: Although I'm committed to the idea of 1x10 with bar end shifters, I'm not particularly wedded to these particular shifters - they just happen to be the ones that I have in the parts bin. So if what I'm proposing is going to be a big ordeal, please say!
One thing you could do is use a Microshift Advent 9 rear derailleur. You could even get the clutch one. They're 9-speed Shimano compatible, which means they use the same actuation ratio expected by a 10-speed road shifter - there are many questions here about this. The Microshift mountain compatible bar ends are another path, but having worked on tons of bikes with them, I just don't like them all that much - the lever motion is sloppy and indeterminate, especially compared to the Shimano one you've got, plus you're buying an RD anyway.