Buy a duster adaptor. It can be used as an extension tip for the propane adaptor as well as a duster adaptor. There are two concentric bores so it is compatible with the propane adaptor tips (as an extension) and as a duster adaptor.
The AI duster adaptor provides a significant extension to a propane adaptor so it's also handy for less common gas products like airsoft revolvers.
Current version duster adaptors are red now. The one pictured is a previous version that was black.