PPL pilots accumulating large hours between medicals would also help identify specific pilots for some gentle questions once their name pops up on a flight plan.
If you enforce this, there are easy way to go around this as hours are self declarative for PPL .
And even if you regulate that you have to bring a cerified log book when going to renew your medical , Pilots log books can be altered easily and even the highly regulated aircraft maintenance books can be "tuned in" to fit the purpose if you own the aircraft,
as to the name on a flight plan , not sure a data base on this is possible, but if it did and you wanted to avoid being flagged, just phone the plans or file on internet and write what you want on that field.
Do not underestimate the ingenuity of those that want to beat the system.
Spending a bit of time in Africa opens the mind to what is possible
