Run 2 chainrings that are quite close in teeth (you'll have to do some experimenting) run the smaller chainring on the outside, so when in polo mode, the chain itself acts as a guard against the bigger exposed ring.
Could always do that and chuck a bashguard on as well, to protect your chainset. I'd deffo go down the triple chainset route.
One thing i have seen another player do:
Run 2 chainrings that are quite close in teeth (you'll have to do some experimenting) run the smaller chainring on the outside, so when in polo mode, the chain itself acts as a guard against the bigger exposed ring.
Could always do that and chuck a bashguard on as well, to protect your chainset. I'd deffo go down the triple chainset route.