My records indicate that VH-AEQ was reg as ZK-WKA on 14 FEB 2002 and was deregistered on 20 APR 2006, still with same owner at Lower Hutt.
Do not know reason for cancellation.
Re the Excalibur's:- imported into Vanuatu as YJ-RV17 and YJ-RV18.
After Vanair, they both went to Sunflower A/l in Fiji as DQ-FEW and DQ-FER. The latter crashed and was destroyed by fire at Vunitavola on 10 NOV 1988 and the other went to Tonga as A3-FEW to fly with Peau Vava'u Air, but do not know it's current situation.
Hope this helps, but, still looking for TGA, was last operated by a chap on Queenslands Sunshine Coast.