Canada Levels for cages

Would a small plastic stool work?

Grids and coroplast cages are much easier to make second levels with, and are much bigger. Maybe you should make one!

Your pig is really cute!

If you are close to a lumber store, you can probably find small pieces of hard wood, like poplar or ash (hard, dry, untreated and low/no resins/odor) for a reasonable cost and then cut to fit across the cage, on the top lip of your pan. You will need to punch or drill a couple of holes at the ends to tie the platform to the wire, so that it doesn't fall on one of your piggies. I had a similar arrangement before I built a C&C cage. You can make a ramp out of the same wood, just put something on it for traction. I might suggest some fabric or window screen around the end, on the outside, where you plan to put their hay. It will be MUCH neater. If there is any way to do a C&C cage, your piggies would just go bonkers!