i cant see why it wouldnt be reliable with forged pistons and connecting rods. once the internals have been uprated it would be the gear boxes that would fail.
the supercharged conversions seem to be unreliable because most people that have done them have not bothered to upgrade the internals. just bolt on supercharger kits.
as for the meg turbo conversion, IMO i would just buy a meg turbo, the clios are all about NASP fun