Cook boneless skinless chicken thigh portions to taste like drumsticks?
Prick holes in the skin, rub salt, lemon juice, garlic/pepper/chilli etc. into the skins and cook under a grill (US = 'broiler', I think) for a tasty, crispy-skinned treat. If you cut the 'flap' of meat off the thigh and cook separately the bit with the bone makes a v. good drumstick substitute. In fact I prefer them.

Incidentally, if the thighs you get are really fatty, perhaps you could switch to a different butcher/supermarket/brand? Organic, free-range chicken is leaner (because the birds get to move around more) and sweeter because they haven't been fed rubbish.

Your karma and tastebuds will thank you for it ;-)

Bon Appetit!