Sure use a regular die and a blank die. On the blank die label the 6 sides with 6 characters each.
ABC GHI MNO STU YZ0 456
DEF JKI PQR VWX 123 789
The D6 determines which character to use as follows
123
456
So if it lands on the A-F face and the D6 was a 4 you would get D