Would you be able to drill tie-down holes through it - I mean are there any metal struts running across the bottom of it? Or you could always make a small portable animation table that sits on top of it. But I think you're right to doubt the stability of it. I have a drafting table like that and it isn't rock solid. And if you'd go through and jam little toothpicks or whatever into all the joints until it is, then you can no longer lift and lower it - though maybe you just want to adjust the height once and then leave it there?
Might be best off just getting some 1 x 2s and MDF and making your own table at whatever height you want. It would cost a lot less.