Finally found a dirty hack that works:
T ct_strip_const_helper(T)( const(T)[] t ){ return (cast(T[])t)[0]; }
T ct_strip_const(T)( const(T) t ){ return ct_strip_const_helper([t]); }
struct S {
static const S ess_const = {1};
int member;
}
struct T {
static const T tee_const = {ct_strip_const(S.ess_const)};
S member;
}