Oh dear indeed mm43! Are proposing we just make it up as we go along??
Last time I checked the WLG 34 ILS chart it indicated that CIRCLE-TO-LAND was "NA". What does that say to a B737 or B767 crew considering your proposed visual circuit during the day, never mind at night or in IMC?
What altitude would you consider safe? There's no published Circling Minima. How far in track miles will it take you to climb to the MSA? Did you brief the other pilot that that was your intention BEFORE commencing the approach or did you just bank the aircraft into the downwind turn without warning? Great CRM that.
Like I said, you need a procedure that will consistently ensure terrain clearance in all situations. You need to be clear about your intentions before you commence the approach.