Adding more IF hours to the PPL training requirements won't achieve anything. Once the pilot looses IF currency the limited hours done during the training will do nothing to get a pilot out of a bind if they end up in inadvertent IMC, mainly due to the instrument scan being inadequate due to the lack of recency, not to mention the aircraft may not adequately equipped if it's a VFR aircraft.
A matter of personal opinion. You don't have to add I/F flying hours at all. Go to your preferred flying school and use their flight training device (simulator) preferably with an instrument rated instructor; not a new unrated instructor,thus avoiding the blind leading the blind. .
Forget instrument training using Foggles or Hoods. People don't normally deliberately "cheat" on purpose. What happens is that it is very easy to see outside the cockpit of a Cessna single via natural peripheral vision even though you are trying to concentrate on flying on instruments. The slightest view of a horizon will cause you to "cheat" no matter how true are your intentions.
Same with the technique used by some flying instructors when teaching unusual attitudes. They get the student to close his eyes and look down while the instructor sets up the UA. This would never happen in real life i.e, looking down at your feet with eyes closed.
The purported reason for the eyes closed is to ensure the student cannot see outside while the instructor sets up the UA. This suggests that peripheral is possible during "under the hood" simulated instrument flying. This doesn't happen in a FTD
There is far more value in practicing instrument flying and unusual attitude recovery training in a typical general aviation FTD "simulator" like a Microsoft Flight Simulator. You cannot cheat and simulated IMC is always available. It is less expensive, too. Encourage student pilots early in their flying (after first solo) so that by the time the student has reached PPL standard, they have 10-15 hours in the IFR simulator. Private pilots should practice in a simulator regularly if they are serious about being competent on instruments. It doesn't have to be in the real aeroplane.