Making an air-duster refillable (quick-ish project)

I soldered a value to the bottom of an invertible air-duster can and made a 3D printed stand to offset the valve and hold a valve stem tool. The invertible air dusters are around £20 so even a single can easily pays off the cost of the valves and 3D printing: https://uk.rs-online.com/web/p/air-dusters/1681646 This is not, however, the equivalent of a new can since they use a substance which is gaseous at atmospheric pressure but liquid when compressed called 1,3,3,3-Tetrafluoropropene: https://docs.rs-online.com/ff56/0900766b816187a4.pdf