Hi,
If these indexes can be represented by material group, you can make use of standard MEKR itself. Maintain the correct material group in the material master and then use MEKR with material group as selection along with other parameters and update the price accordingly.
Another option would be external material group field (in basic data 1). But here, you have to copy and modify the standard program for MEKR to include the external material group in the program selection.
Regards,
AKPT