I fail to see what's so bizarre about my suggestion - since the Earth is flat, a properly conducted series of experiments should support this fact.
Try this experiment (try and conduct it properly):
Mark out an area on a flat floor to represent the flat earth. Mark out the equator. Now get a torch or spotlight (the sun acts like a spotlight we are told) and however you want to do it mask the lens of the torch/spotlight so that it illuminates the flat earth representation the way the sun does.
Now circlulate the torch/spotlight sun around above the flat earth equator representation that you have drawn on the floor so that the light, as it does in reality, goes from east to west. When you can do this comfortably introduce a moon. Use a piece of card or a small ball or something to represent it and now move the moon around in a circular pattern to simulate what it does in real life - it too rises in the east and sets in the west.
When you can do that, simulate a total eclipse of the sun by moving the moon into a position immediately below the spotlight. It doesn't matter if the sun overtakes the moon or vice versa but do try and make a shadow on the representation of the flat earth. Continue to move both 'sun' and 'moon' in a circular pattern that goes from east to west. Notice the way the shadow goes. If both the 'sun' and 'moon' are circulating from east to west (that's clockwise if viewed from above) the shadow will also have to circulate clockwise (if viewed from above) or travel from east to west. It will also move in a circular pattern as both the sun and moon are moving in a circular pattern.
Now do a bit of research on recent total eclipses of the sun (there was one this year) and check which way the shadow went as it moved across the earth. You will find that not only did it go from west to east - the direct opposite of what would happen on a flat earth, but it almost certainly didn't describe the arc of a circle as it would have to on a flat earth. There is another total eclipse next year so you can try a bit of direct observation if you want to. I'm sure there'll be ample news coverage to tell you where to see it and which way the shadow will travel across the earth - it will, I am sure, go from west to east.
Now, if the shadow goes the opposite direction during a total eclipse than what it should do on a flat earth, the earth cannot be flat. If the shadow during a total eclipse does not follow a circular path across the earth like it should do if the earth were flat, the earth cannot be flat.
There's 2 simple bits of observable evidence that the earth cannot be flat. You can forget going into space to see the curvature, you can forget the Bedford Level load of shite, you can forget bendy light because the earth cannot be flat if the shadows cast by a total eclipse of the sun do what they do. Even bendy light couldn't make the shadows go the wrong way.
The earth cannot be and is not, flat.
HTH