I think someone mentioned the idea of using the S-band RX converter as an intermediate IF. I was playing around with the idea of using an MMDS converter with a C-band mixer. If you can move the LO in the MMDS converter up to 2700 MHz, that gives you a 3130 MHz IF for 5830. If you then use the MMDS converter's guts for the second conversion (you may have to tweak a filter or two to pass the 3130), you will get 430 MHz IF received. In other words, you can use the MMDS converter's LO for both first *and* second IF.
Granted getting those things to oscillate at 2.7 GHz is a ways from where they were designed. Still, it might be a fun project....and you get to do a little algebra. It may be easier just to get an old PLL brick, preamp, filter and mixer. RX or TX converters aren't too hard to build since you can generally avoid complexities for TR switching.
-Andy K0SM/2