The planning aspect is all well and good, and longer term, should, reduce cost, alternatively, make cost TRANSPARENT. However, that cost will not reduce if the regime is to align GA to the same disciplines as airliner/commercial groups.
Following a GMP/LAMP schedule, to the letter, only increases the cost to the owner/operator. Example:-
Manufacturers manual recommends overhaul of a gear motor at 1500hrs.
Under LAMP/GMP, this would in EASA mandatory, under FAR 'on condition'.
The owner, assuming a duty of care and diligent owner, may well plan for that overhaul at a time interval that will average his cost. Under the LAMP/GMP, that choice is removed. The issue is that every nut and bolt and hydraulic hose, would appear to be mandatory replacement out-with FAR.