I don't see a static price assumption, just some market price for miners to get coins. The key question for me is whether there's a market for exchange of a 110 coin to other cryptocurrencies including stablecoins

You need 100 blocks confirmed on the bip110 chain to sell the coins mined in the first block after the split. Assuming no emergency difficulty adjustment is made, which is a hard fork. 100 blocks may take few months to be mined. So at least from freshly mined blocks, there won’t be any sell pressure.