I've been there, done that - I had a cracked ClearView XXL as well. Clearview will NOT, repeat, NOT recommend any 'glue' or repair on the windshield due to liability issues. SO do not bother asking them. I guarantee you they will tell you that.
If you search, I had documented my problems with my ClearView. I searched, spent the money, got the acrylic glue, taped, drilled and glued the crack (the crack started by the bottom left hold and traveled up and inboard.
The glue did not work, though I specifically and carefully followed the instructions. The windsheld flex was too much. It continued to crack and finally at 70 mph it let loose. I had to immed slow and grab the shield to keep it from flying off.
I did not try the soldering iron thing on the acrylic. I am pretty convinced that the best way to go is to just eat the loss and get another windshield. Lucky for me, another member up the road a few miles offered to loan me his spare OEM windshield until I can get mine here (Canal Winchester, OH) from AZ.
Repairing a windshield with a large crack is just too dangerous and not worth the risk. I actually rode my 650 around for several weeks sans windshield and enjoyed it (full face helmet). The helmet (Scorpion EXO 700) is actually quieter in full wind than with OEM windshield and turbulence over the top of it.