YOU could get some platform shoes and raise your feet off the ground OR use a foam block 2" thick for your feet.
There's just not a good way to saw it off and reglue the piece back on and get it "invisible" as well as strong as original... BUT if that's your only choice here's a method. Wrap painter's tape around the cut off area and make a couple of lines running parallel to the leg for orientation later. Use a fine tooth saw, a Japanese pull saw and a guide block for 1 1/2" length and squareness.
After sawing the 1 1/2" off, the next issue is making holes in both the end and the leg for a 1/2" or 5/8" dowel. Make another guide block with a large hole for the leg diameter and a 1/2" hole for the dowel to keep the holes on center. Use a drill press and Forstner bits. The holes should be about 1/2" to 3/4" deep on the leg parts.
Next comes gluing or epoxy to reattach the ends. I'd use epoxy for strength and bonding to end grain. Line up your marks and ... go for it. If you work fast, before the epoxy sets up, flip the chair back on it's legs and put some books on the seat. Wait 24 HRs before sitting on it.
Here's the biggest issue!
When taking out a section from a tapered leg, chances are that the diameters will not match up perfectly. So, your only choice to get an invisible joint is to sand down the larger diameter. OR ... by carefully choosing where on the foot to make your bottom cut the diameter may match up......