I've been strugging too, all I find is 3 * 144 MHz transponders in Ka-band.
I'd first try 19.7...20.2 Ghz, Hispasat 30W-5 uses that portion as well.
As
@satosk would say, i'm fishing in two new Ka sea's at the moment trying to catch something , 42.5° East and now 26° West temporary slot.
As i am rigged at the moment, only the 1.25 Gibertini installation looking at 42.5°E has monitoring for band B and band D but will not come round to cover orbital slots greater than 1°W upwards.
The other "rod", the 1.8CM is looking at 26° West temporary slot but only has Ka band D monitoring, so can't fish for 19.2 to 20.2 fish at the moment. I might have another modded band B Hughes lnb somewhere that i could put on the 1.8 ?.