In the past you could work around and set up variations however its no longer allowed and I would recommend against it. The algorithm doesn’t like it and my belief is they penalise you for it. When I unpicked my variations 2 years ago my sales increased massively!
I can’t categorically prove above but variations is to be avoided in this category even if you can find a back door to do it.
I don’t know your products but are variations necessary? Increases risk in a number of ways? Cash tied up/inventory levels/PPC/IPI etc.