Annealing index and primers for multiplexing

[alisrpp]

Hi,
We are planning to do a multiplexed cDNA library to run on Illumina . We bought the indexes and primers from IDT (sequences from Illumina) but we have some questions. We were reading that Illumina changed the protocol and now it uses the index+PCRprimer (all together) instead of using the index as a "third" primer.
We were thinking about annealing the index+primer and use it as a single one but we are not sure if it is gonna work. Does anybody have tried that?
If so, which temperature?
Otherwise we will use as separated things. Has anybody got good results with this?

Thanks