Hello,
There is no solution :) You need to use the access DB, or make your own scripts/programs/tools to make the modifications.
Please be aware, that you need to "translate" what you receive from swat-cup into an "absolute value". I.e. r_CN2_0.1 (if I remember correctly) does not mean that CN2 = 0.1. Please refer to the SWAT-CUP manual, where Karim explained these changes very well.
Best,
Natalja