No--the 2" dome is not going to be tall enough. However, I never use those humidity domes that come with those trays. They are flimsy and I never ever take anywhere near 72 cuttings at a time. Since I don't have an over abundance of room, I don't need or want a huge tray in my space. Do you plan on doing 72 cuttings at a time?
I have pretty much given us using those try kind of things to clone as a bubble cloner just works so much better and faster. However, you may find (like I did) that the tray takes up way too much room and is simply too flimsy. So, my 72 cell propagator got cut into smaller sections. I generally use some kind of plastic container with a lid to hold the cuts and keep the moisture in. I have found that heaters do not work for me--I have never had them work--they always got too warm and were detrimental to good root growth so I don't use them and haven't for years. Be sure and monitor your temps very carefully if you plan on using a heater with the cuts.