Would any instructor and/or flying school be prepared to be responsible for letting someone loose with the minimum hours the LAPL(H) rules allow? I certainly would not.
There are very few PPL(H)s who manage to achieve a pass standard and complete the syllabus in anything approaching the minimum hours for that licence. I see no way that a LAPL(H) will be able to achieve a satisfactory standard unless he does enough flying time to get a PPL(H).
Another poor decision by the EASA jobsworths IMO. Helicopters are NOT the same as FW.