Have you considered removing action from stock for transport - I think a standard trigger lock could be made to work on the action alone. I know it is a pain as gun would need to be re setup on arrival but just a thought!
FTP900 +Sightron S111 10-50 x 55
AA Pro Target in FWB FP70 stock + MTC Mamba lite
Daystate Airwolf + Bushnell Elite 6500
" life is about the memories we hold and not the things that we own"