Falconcaprinius

Hi everyone, first post here, Correct me if I'm doing something wrong or I'm posting this in the incorrect space. First of all I wanna say that I have a 3rd party 3d printer and I use ultimaker cura (4.3) to create the gcode files. The piece I want to print is like a flat rectangular frame with thic bezel (and a big square hole in the middle) and i have to print it upright (touching the bed with the smallest face to clarify) due to print space limitations. Here's my problem, I don't want to use a lot of material and the only support avabile on Cura without plugin (if u can suggest me one I would appreciate) are the tree and the normal one and both start from the bottom of then print plane or fill the whole hole (wasting a lot of material and time). My idea is to create a support starting by the lateral hole faces and with a 45 degree angle get to the upper hole face (to support the print of the topmost bezel). Is that possible to create such a support in Cura? Ask me for more info, maybe i will upload some images later. Thanks in advance for your help.