I might just try to ignore this comment... My biggest worry is precision in placing things, I make my own blueprints but I normally trying to start from scratch for each new game (just my playstyle, not saying it's good/smart) and it being fiddly on the deck. I played a few games with only mouse support and quickly abandoned them since it got old fast. I know Factorio has great keyboard support though and they do have a Switch version so maybe I'm worrying about nothing. My other worry would be performance since my older laptop has some trouble when my base got large enough (with mods) but maybe I'm just making excuses.
Using the touchpads as a mouse works really well. I like to set them as trackball, but there are multiple options and configurations that one is going to feel good for you.