Semantic Lookahead

Is there a syntax that permits methods to be used in semantic
lookahead? Instead of writing

void BC() :
{}
{
  "b"
  [ LOOKAHEAD( { getToken(1).kind == C && getToken(2).kind != C } )
    <C:"c">
  ]
}

I wanr write

void BC() :
{}
{
  "b"
  [ LOOKAHEAD( { myBoolMethod(1, C) } )
    <C:"c">
  ]
}

with

boolean myBoolMethod(int k, Token t)
{
  return getToken(k).kind == t && getToken(k+1).kind != t
}

defined somewhere, so that myBoolMethod can be reused elsewhere in the
grammar.

Thx.