If you really want to get involved with DeFi, you've to accept the risks that with it. The only pairs that have such low risks of losing value to impermant losses is those pairs with stable coins. The ones with one sided stable coin pair are less risky and those with stablecoins on both side of the pair are almost risk free. So you just have to pick which you want it to be. Stable coins pair - Less risky. Volatile pairs - impermanent loss risk.

I'm personally farming rewards on Ref Finance (like others) and I'm on the following pairs:

REF/WNEAR
DAI/WNEAR
PARAS/WNEAR

Overall, The DAI/Wnear pairs suffers little to no losses except there's a huge spike or decline in NEAR's price.