They make 12 volt ones like this $20 unit from HF: https://www.harborfreight.com/12-volt-1-2-half-inch-emergency-impact-wrench-92349.htmlWhile I would use an air gun (I’ve got several), the OP is new to the hobby and doesn’t have a big selection of tools. Air gun requires impact sockets and compressor.
While I agree that it’s the best approach, suggesting the purchase of a compressor, sockets, and gun might not be practical.
Here's different car from the Honda that uses the same method to mount the strut assembly to the body:I’m concerned about the design of your struts. The struts I’ve worked on are bolted to the body by a couple of nuts that hold the strut plate.
That hex head top nut holds the spring seat in place. You do the top nut AFTER the strut is out and the spring compressor has removed the tension from the nut.
Are you certain that you should be unbolting this top nut? Is the spring tension accounted for?
Got a picture of your car?
.....So, normally one holds the strut shaft with a hex bit (or hex key) while using a 17mm wrench to spin the top nut free. Unfortunately, the hex key has STRIPPED the hex hole on top of the strut shaft.
When I did the rear, it got stripped too (why????? salty air probably!) but I was able to hammer in a torx bit which held the rear damper strut shaft in place, while I spun the top nut free.....