Can you receive those two signals now, using two dishes?
What size dishes are required?
I'd consult some coverage maps to see how strong a signal is likely available in your area.
Off hand, I would guess that 61.5 doesn't deliver much of a signal.
But, if there is enough signal , then the Invacom QPH-031 LNBF, which will receive linear and circular signals simultaneously, would be the only choice.
It has two circular outputs and two linear outputs, each using a different Local Oscillator frequency, as required.
You could feed two receivers with a signal from each satellite, or use a 4x4 (or 4x8) multiswitch, to feed several receivers with a choice of signals.
See the Switches Simplified thread in our FAQ area for other switch ideas.