tubby linton - That would be consistent with the ethos we are operating to. Revised advice in our company was published a couple of weeks ago.
The PAPI's are at 3.7 degrees and approach chart is published at the standard CDA of 3.0 deg. As you mention the 3.7 degree is outside the Cat C/D criteria.
The revised advice is along the lines of flying the 3.0 deg Rwy 21 VOR as a CDA to circling minima, visually acquire the PAPI, fly a small level segment at MDA until intercepting the 3.7 degree visual slope then continue descent to runway 21.
This was probably deemed a safer option than overflying Runway 21, turning left-hand downwind (circling procedure) and then start a descending left turn towards terrain to roll-out on finals for Rwy 21.