in theory, it might be possible. You would have to make a feedhorn with waveguides that bring both signals together with the exact same phase (equal length of waveguide).
in practicality, this would be very difficult to achieve, abd it would be much easier and cheaper to just get a 90 cm dish (and also much more reliable)
I think someone posted here about such experiment some years ago (I want to say, around 2016-2018) and if I remember well it was not successful