You can hatch in the bottom of a cabinet incubator. It complicates lockdown and adding new eggs if you set on a schedule, and the humidity ups and downs needed are a bit of a pain, but I have 2 little Ameracaunas in the bottom of my Sportsman right now that says it works fine.
Luckily, last night when I wanted to set the eggs for the week, the eggs in lockdown on the bottom had not pipped, so I opened the door and put them in. It might have been bad for the hatching chicks if they had not been a day late hatching and got a blast of cool, dry air.
I'd go with the cabinet and keep an eye out for a used "styrobator" for hatching. You might even want 2 if you intend to fill the trays with eggs, because 1 tray can hold more eggs than a hovabator can fit.