Use one of the solutions that allows you to accept btc & convert to your desired fiat currency on their backend. 

You don’t need to touch btc at your end, while still being able to offer lightning as a payment option to   customers.

For your financial planning keep the amount / percent of savings you want to in btc, the remainder in fiat. 

Fiat will reliably & with stability loose purchasing power every year, BTC will increase in purchasing power with decreasing volatility. Only need a 2+ year time horizon on avg for that volatility to become favourable to your business savings. 

If you have a business with cash flow that allows for zero savings, say week to week or month to month, instead of 2+ years timelines, then just offer btc as payment option & keep saving in fiat