Do used original screens come up for sale with the explorer. If so might be worth picking one up to experiment with. i.e. cut one down a bit at a time. Or try the bike without a screen at all. Admittedly I'm not familiar with the 1200 as I am with the 955, 1050 and 800 tiger screen choices.
Funny you should mention this I woke up this morning thinking about modifying a standard screen. Not my usual waking thoughts lol. Must be playing on my mind a bit.