You can also adjust the setting blocks around the Lone Star, as well as adjusting the border around it.
You will probably also need to adjust your fabric purchases as well, if buying all new fabrics for this.
I don't blame you for wanting to adjust the measurements... when a pattern calls for 7/8, 3/8, etc., I round it up and figure it out from there. I have enough headaches with "regular" measurements, sometimes. I'd rather figure the math than strain my eyes trying to cut that extra eighth inch.