Tighten both the BB lockring and the cog down plenty tight and you'll be OK. I ran a setup like that on the street brakeless for a few months with not a bit of slippage, no loctite involved. If that side is only going to be used for the track, though, it's probably no big deal since you really don't put down much backpressure on the track. Hell, a lot of racers don't even bother with lockrings on the track...