I was told by CCL that the widebody experience is required to fly the B777:
" We have received many requests from B737 captain to upgrade to the B777 or B744, this will not be possible under this program due to the Widebody requirement."
About the cost of a type-rating, Alteon/Boeing told me that it would cost me US$ 23,000.00 for a single pilot to do a transition course from the B767 to the B777.
Maybe for a complete crew (2 pilots) it would cost half of it.
SF