Hello and happy holidays everyone!

I am about to pull the trigger on a V700, because eventually I plan to scan some 4x5 negatives, but also 35mm and medium format. I don't want to spent the money on the betterscanning holders or mounting station, so I plan to buy a sheet of AN glass from focal point and tape the 4x5 negatives to the bottom. My question is, will this method also work with 35mm and medium format? Would it be a good idea to also order a sheet of clear glass to make a scan sandwich? I am sure I will need to make a mask for the different formats out of something like black construction paper, but I am just not sure that the scanner will recognize the film or if this is a practical idea. Any help is appreciated. Thanks.