I assume you don't actually need all of the transmission line s-parameters at low frequency. In which case, you can use a frequency response analyzer (FRA), of which there are a few in production. The gain and phase measurements are enough to plot transfer functions, impedance, Bode, and Nyquist.

The FRAs span the same price range as the VNAs you listed. Having a low-cost version of each can extend the frequency range over which you can make good measurements compared to just one tool of similar total price.

The Bode 100 sacrifices some low and high frequency range and performance to be a 2-in-1.