Boot floor liner

First post here and new to ownership. I've got a TransK9 dog crate in my boot but because I don't have the variofloor the door of the crate ever so slightly catches on the boot lip when I open the crate. Retrofitting a variofloor isn't something I am interested in (already searched the forum and it looks impossible!). What I could really do with is a boot liner that is an inch or two thick just to lift it ever so slightly. My next step would be to go down the route of knocking up a false floor but that leaves the challenge of getting to the spare wheel when I need it. In short, need a 1 to 2 inch thick boot liner that would lift my boot floor slightly and can be easily removed if I needed access to the spare wheel. Anybody have any ideas? Thanks!