Unfortunately they won’t work together- road 10 speed will work with mtb 9 speed but not mtb 10 speed due to them having different pull ratios.
As for the OP, if you run Sram then it’s ALWAYS time to change to Shimano. Shimano mechs are much tougher in my experience and if, as wysiwyg suggests, clutch mechs don’t work on a DH bike (though I can’t see why, if a clutch affects your suspension then your suspension is probably rubbish- maybe he’s been sipping the Mojo/Chris Porter kool aid?) then you can turn it off and it’ll still work as a mech, unlike Sram.
I’ve had a Zee for 3 and a half years before it imploded. Bought another to replace it, lasts much longer than XT for me.