It would work but probably wouldn’t fit in the light. 
Instead consider putting the second set of 7135’s on a purpose-made slave board such this 16mm one by Mattaus:
https://oshpark.com/shared_projects/ASrNWWhu
via Rufusbduck’s Oshpark Projects thread.
EDIT: (You’re still going to have to do some cutting/drilling to get all the wiring forward of course!)