Optimal picking route (Walking route) throughout warehouse

Dear Gurus,

Could you please advise. For a customer I have to set up the following picking route (Walking route):

Situation: Each Aisle has 100 storage bins

Aisle A -> Bin 01 till Bin 100

Aisle B -> Bin 01 til Bin 100

etc

For example:

Following Bins are involved for picking

A-01

A-04

A-05

A-47( This is the last BIN in Aisle A and the first location in Aisle B is B-28. So order picker has to start in beginning of Row B)

B-28

B-29

C-01 (Order picker has to start in Beginning of Row C)

D-85 (Order picker has to start at end of row D)

D-70

So S route will not work for this customer. Question, which user exit can I use to set up this picking route?

Br Richard