You need something like a pin bed, but they can be spendy or time consuming to make...
Or you could try some of my 'bandaids' when I need to raise parts off the table... for one, I have a zillion 4/40 size SS lockwashers that I'll lay out on my flat table, they're very consistent and raise the plate off the table about .040", works great for clean edges on Rowmark and similar. You could probably get way with using large lock 1/2" lockwasher to get more air space. Just lay them about on a solid table, making sure they're not near where the beam will be cutting to prevent flashback. Cheap, temporary, and they work. Another 'thing' I use is 1/16" diameter gas welding rod, cut them to the length you need so you can make sure the beam misses them. Put a very slight bend in them, then they won't roll. These you can use on your honeycomb table