Yes, there is a simpler way and that's not to do any calculations at all. The basics are set forth in the Primer in the Stickies. The general idea is that you get the alkalinity out of the water by diluting it with RO to the point that the alkalinity is no longer significant or that you use 100% RO water. You then, based on the type of beer, use a specified amount of sauermalz (acidulated malt) usually 1 - 3% on the assumption that base malt will, with low ion water, come to a pH of about 5.7 and that you want to be about 0.3 lower than that. If you use darker malts you use less sauermalz up to light gravity stouts where you use no sauermalz. Heavier stouts: you are on your own. These may require that you add alkalinity.
This approach will usually get you a good beer. It's more or less the way people brewed in the days before they had computers and it's the way I brew now but I have done thousands of spreadsheet calculations and have the benefits of that experience.
A better approach is to take the grist you propose to use, put a pound of it in a pot with 3 pints of water, heat to strike temp and measure the pH with a good meter. Now add acid or base until the desired pH is reached. It takes a fine hand and you may overshoot. If you do start over until you get the hang of it. Keep track of the total acid required and scale that from 1 pound of grist to your full batch size. You are measuring the 'alkalinity of the mash.