I been looking for this myself and had a debate about it in the HEX discord channel. There is the option to make a "limit order" at 1inch, but its not a viable solution, because eventhough its fee-less (almost or 100%? I am not sure), there is a big chance that it will not get filled, since the price mostly move UP!

As it is now, is my conclusion, there is only the way to pay the high fees for buying and staking on Uniswap/1inch, then when the PULSEchain is launched there will be low fees for pHEX.