My thoughts would be contact the manufacturers and distributors of airguns and simply outline what you are doing and ask if they can help in anyway.

I would also contact the ATEO, think thats the initials airgun training speak to Dave Mills to see if they can help at all. Pop along to the shooting show over the weekend they'll be running the have a go area.

Sorry not a recommendation if any specific kit as such but advice on getting started.

Matt