> Presumably the integration (transgenesis) reported in the original Maori paper was a chance event where the IAPV sequences entered the germ line

Why do you say this? It appears that subsequent research shows other viruses in the HB genome as well.

Black queen cell virus (BQCV), Deformed wing virus (DWV),
Acute bee paralysis virus (ABPV), Kashmir bee virus (KBV),
and Israeli acute paralysis virus (IAPV) specific primers were
used to test integration into the A. mellifera genome.
Honeybee actin and a small region indicating viral infection
(not found in the bee genome) were used as positive controls. 

Traditional PCR along with gel electrophoresis for
each of these bee viruses showed that DWV and KBV have
integrated into a segment of the A. mellifera genome.

Tufts, D. M., Spencer, K., Hunter, W., & Bextine, B. Integration of Picorna-like Viruses in Multiple Insect Taxa.

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