I’ve been making my own wax pens with one of these miniature soldering irons: https://www.mmnewman.com/product-category/antex-soldering-irons/ and a light dimmer switch for over 30 years and they work great, with ultra fine tips if you want. I did purchase one of the Pepe Touchmatic Wax Pens a few years back, mainly for the touch control, but I found it to be a bit awkward and the smallest tip they offered wasn’t as fine as I would like for some of my applications, so I seldom use it. It is nicely made and would probably be great for some users, but it is pretty expensive (relative to the $50 for the miniature soldering iron and $20 for a dimmer switch and box), however if you aren’t into build it yourself tools, it might be just work for you.