This is a situation that many crypto companies would find themselves in. And there are multiple companies which use 2 tokens in the ETH ecosystem. I will give you a couple of examples:
1) Maker has 2 tokens - the DAI and the MKR tokens. The former is pegged to USD 1 and the latter is a bet on Maker's business
2) Digix has 2 tokens - the DGX and DGD tokens. One stands for a certain amount of Gold (1 gm if I recall correctly) and the other is a bet on the Digix business model
So feel free to use 2 tokens if your business model requires it.