Help with set-up on new Tank with drawer

Good morning,
I need some help with coming up with a solution for a new tank i purchased. It is a Thrive Easy to Clean Aquarium 40G. I have my girl in a tub that works well but I bought the tank to see her more. The new tank has a plastic drawer on the bottom so if i place a UTH pad the heat has to go through glass and plastic (two layers) and is not warm enough. The pad will not fit between the drawer and the glass (:(). If I had a basking snake it would be perfect. I do have a Kane heating mat but its just a tad to big -18"x18"(although if i shave the mounting sides I could probably fit it in). Right now I'm thinking of using the UTH pad and then purchasing a ceramic heater. Wondering if it should be 75W ceramic or 100W as it will be added heat? I contemplated putting the heat pad direct contact (not recommended I know) or maybe placing a piece of glass over pad? I have a rheostat for the kane pad and a thermostat for the UTH pad.

My girl is happy in her tub enclosure until i get the tank just right!
Thank you,
Christina