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If you have any more research available on this, it would be apricated.
The only information we currently have on Gazelles being tested (Aside from unguided rockets in the Falklands) is F-ZWRI, which now resides at the Newark Air Museum. This early variant was tested with HOT launcher tube test racks, as well as some other weaponry during its lifetime by Westland at Yeovil for the British military services:
Currently F-WTNA also appears to be another promising connection as it was displayed at Farnborough and several other British air shows when Westland and Aérospatiale were trying to promote the vehicle.
There are also several sales brochures and other media items that reference this, however it requires further review.
There are other options also, however so far they remain too obscure really for consideration. Such as the AW159 Wildcat and AW149.
The AW159 Wildcat is already in service and has completed weaponry trials, but much information on it is still unknown
Today also at RIAT the AW149 took a step closer towards possible UK service, with Leonardo announcing that the subsidiary Augusta-Westland / Leonardo UK factories in Yeovil are being prepared to take over production of the helicopter if its selected for British service to preplace the Puma. However again its far too soon and unclear if this will fully materialise into something viable either.
Many of the other Lynx variants were also considered, however there are some information gaps and questions again of viability and usefulness in game aside from the existing Lynxs.
But any further suggestions or information is always welcome