This is not such a bad idea.
I'm in a racing league. Three (out of 32) have been using Fanatec, and they all have had problems with them from time to time. One guy bought both simulatainisly. He liked the GT3RS+clubsports better than the G27, and had the Fanatec hooked up to the PS3 where he played the most and the G27 to a PC. He from time to time had small issues with the fanatec wheel and also the pedals. After a while he had enough of the constant problems, and now he is using the G27 to the PS3.
I have a G27. When later purchasing a wheelstand Fanatec had an offer basically getting a Carrera for 80 Euro which I bought. The G27 pedals are a big step up to Fanatec's standard pedals. I never tried the clubsport pedals, but I'm sure they are a big step up from the G27 pedals.
I'm sure the clusport pedals are superb (as is the GT3RS), when they are working. But knowing the problems my racing friends have had with with their Fanatec equipment, having a backup solution is not a bad idea.
Tough call actually.