I don't think so because I believe they banned the dropside due to injuries. here are probably a lot of barriers to invent such a thing, at least in the USA. I got the ikea non dropside and I am too short to put my baby in there. We cosleep so it's okay, but if I was really relying on it I'd be pretty bummed.
Sorry I am no help. Are you handy enough to invent it?
Please invent it! :) I've racked my brain to figure out an easily-removeable "4th side" for the sidecar, for when baby's there alone. I didn't feel comfortable with the safety of too much improvising, so instead DD starts the night in a pack-n-play then comes to the sidecar when I go to bed.
Definitely look for a high-quality, sturdy crib. Our crib is a Ragazzi dropside, bought used before dropsides were banned. It's awesome! Sturdy enough for me to scoot in there to nurse instead of trying to move a sleeping baby back and forth.
I had thought about making a 4th side out of plastic plumbing pipes, with mesh netting like on the sides of a pack-n-play. The idea being that you could slide it between the crib rails and snap it into place, then slide it out when you come to bed. But gave up before trying it!