A couple days ago I was playing with the Number-Letters code a couple days ago and I started experimenting with Key based encyptions and I kind of accidently created this

Basically, first you turn every letter into its respective number. A=1, B=2,C=3... etc

Next you take a Key which is composed of a natural number (preferablly an odd one) and 10 unique characters. You then multiply every digit for each number by X (The natural number) and take the results and display them side by side.

Example Key: 3YuGbK6FqzR

This Key means that
X: 3
1: Y
2: u
3: G
4: b
5: K
6: 6
7: F
8: q
9: z
0: R

Using this key we can take the numeral alphabet and turn it into a modified alphabet.

Numeral Alphabet:
A: 1
B: 2
C: 3
D: 4
E: 5
F: 6
G: 7
H: 8
I: 9
J: 10
K: 11
L: 12
M: 13
N: 14
O: 15
P: 16
Q: 17
R: 18
S: 19
T: 20
U: 21
V: 22
W: 23
X: 24
Y: 25
Z: 26

The Modified Alphabet would look like this:
A: G
B: 6
C: z
D: Yu
E: YK
F: Yq
G: uY
H: ub
I: uF
J: GR
K: GG
L: GF
M: GI
N: GYu
O: GYK
P: GYq
Q: GuY
R: Gub
S: GuF
T: 6R
U: 6G
V: 66
W: 6z
X: 6Yu
Y: 6YK
Z: 6Yq

Here is an example encrypted message: 6RubuFGuF uFGuF G 6RYKGuF6R GIYKGuFGuFGYK 6RYKGzub GYqYKGYKGYqGFYK 6RubuFGuF z6YKGYqubYKGub
(Hint: Always read left to right)

So I played around with this a bit more (because the code seemed lack-luster to me) and then it hit me.
A two keyed cypher.

Before turning the Alphabet into the Modified Alphabet you use a 26 natural number key, and replace each letter with it's respective number.
Here is two keys and a message

Digit Key: 2UukqHTGKnI

26 Numeral Key: 560-215-771-438-159-692-908-445-197-373-757-32-702-163-483-718-212-995-461-231-405-981-654-679-796-13

Message: qTuKKUIuUKKUuU UqIqUUIUnKUuUKUuUUIUuIUKIUKUUIUn uUKKUuU KKUIuUKUKIUKKKUITuUqUKUu UUIUnuUuTUqUquUKUKUIUqUKUuUquUTqTuUUIUnKTUT

Try to solve.