I mean, I don't get the question. If you want to have delta exposure, trade the futures or the ETF.
If you trade options there is no single scenario where you are always flat vol unless you trade a synthetic forward...but then you better trade the underlying anyways.
Vertical: Spot moves to long strike -> long vol, spot moves to short strike-> short vol
RiskReversal: You can put it on vega neutral but you have vol exposure through spot and skew
Please define exactly what you want to achieve and why you don't want exposure to vol when you short calls to pick tops.