I would create a mandatory match-play event for the top 64 in the world played over 5 days with a 36 hole final. (Only excuse is doctor’s note.)
However, it would be held at a classic golf course rarely seen by the PGA pros. (e.g. Yale, LACC, Old Macdonald, Sand Hills, St. Louis CC, etc.)
They would have to play without yardage books, pin sheets, or their regular caddies. They would have to use a stranger (but golf knowledgeable) golfer as caddie who also was unfamiliar with the course. The course would have ALL yardage information removed from the course. The only yardage would be the yardage from the back of the tee which would be noted on the official scorecard.
There would be NO Ground Under Repair. The whole course is played as it is found. Bunkers would not be raked all week.
They could only play two practice rounds, and they could not refer to any notes during the round (other than a tournament rules sheet and the Rules of Golf).
Finally they would be restricted to 9 clubs; the driver and any other non-irons & non-putter would have to be wood; and no wedge greater than 56 degrees; and using a tournament ball that is similar to a pre1980 Titlist.
In other words, they would play on a very good course, but otherwise they would play golf they way a lot of us play – under imperfect conditions, with little course knowledge, and with inadequate equipment.