You are best off putting another dish up, and using a Diseqc switch to switch between them.
Have a look on
http://www.lyngsat.com, you should have access to plently of satellites, the usual 30W, 1W, 19E,13E etc 26E is also worth a look too.
The site has footprints for all the sats and you can check the dish size needed.
The problem with a re-broadcast dish is you have no idea where it is pointing in relation to the satellite arc. So adding other LNBs could be impossible. The dish elevation may be far too low.