I wonder what will you do if you will have a puncture
I recommend after you put the tires on, just take them out and put them again as a drill
I'm cruel I know I'm
One thing nobody asked you, is the one side of the tire sits on the rim, and you try to just add the other side?
If one side is in the rim, then the tire is good size. If you didn't insert one side on the rim, and you try to pull both sides the last 15cm, just give your self a slap... or I will give my self a slap, for asking stupid questions
From my motorcycle days I remember you need to use force. Now, the tiny plastic tire leavers will not work.
You need something stronger and longer. This will give you the leverage you need to tackle this tires.
Try to get help of a friend, I understand it is hard to control two levers together. When you will have 4 hands, try to work with 3 levers, maybe this will help get it in.
And for my first statement, really, what will you do if you will have puncture? This tires seems stubborn!
Keep us update.
Kfir