It is possible to buy an airdeck floor for a Wetline 265, but you may be put off by the cost, as I was.
I can't say if it will fit your dinghy if it has been designed for slats, as the airdeck version has an inflatable keel fitted internally, which the airdeck forces down to create a sort of vee profile to the bottom.
The airdeck itself is flat bottomed though, so it probably would fit.
CJ
It is very expensive (£100 plus) for the airfloor; hence, It does not worth it. Also you will need the inflatable keel to make it stable. It will be cheaper to buy a new tender