Variation of Hill Matrix (Matlab)

I want a program to cipher text divided in three steps. The first step would be a usual 3x3 Hill cipher using 36 characters, the second step would be taking each entry of the resulting 3x1 vector and change it using a base 6, for example, if the resulting from step 1 is p = [18,9,34] we would change it for [6x3 + 0, 6x1 + 3, 6x5 + 4] rearrange the resulting numbers (3,0,1,3,5,4) into a 2x1 vector by doing the next process: p = [36x"3" + 6x"0" + "1";36x"3" + 6x"5" + 4], this 2x1 vector would have 216 possible characters, the last step would be to apply a 2x2 Hill cipher to that vector and that would be the resulting ciphered text. All of this with its inverse process to decipher.