I feel that the groove bricks are important to the look of the facade, so personally I would not swap it out for another brick. I would suggest:
1. Switch to another color as you mentioned. Sand blue is cheap because of availability from Pet Shop, and looks good.
2. Keep sand green, but only use groove bricks where necessary. Some of the 57 bricks have the groove facing inward or facing another brick, so those can be swapped with a normal 1x2 brick without affecting the appearance. I can't recall how many it is, but you might be able to find it in that Eurobricks thread or by looking at a LDD model of the set.