Rick Murchison once bubbled...
Whether you are diving a weight integrated BC or a BP/wing and steel tanks without a weightbelt you're faced with the same problem if you need to get out of the scuba unit. Regardless of whether you're wet or dry, you're most likely going to be pretty positively buoyant if you must remove the scuba unit, so...
In the pool, when removing the scuba unit for drill, if you can keep the center of positive buoyancy (you) directly under the center of negative buoyancy (your scuba unit), the exercise is an easy one. Just maneuver to keep the scuba unit above you at all times and you'll find the weight integrated (or BP/wing/steel) unit is actually easier to control than the non-integrated system, as donning it is simply a matter of letting it drop in place.
In the real world, if you must remove the unit to get it untangled, you may not be able to stay under it, and you'll just have to hang on until you get the unit free and can then roll up under it for control and ease of getting it back on.
If you'll just think about and work toward staying under the unit you'll find that dealing with the weight-integrated (or steel tank/BP/wing) unit really is a piece of cake.
Rick