Just by curiosity I tried it on Caché
>>>  Cache for Windows (x86-64) 2018.1.3 (Build 414U) <<<

As ZPM is missing I had to use the manual installation
Following strictly the installation guide It got up and running immediately

It fully fills all my needs from any of my browsers.

in Caché  $system.SQL.Export()  writes all DDL to file  
adjustment for MS SQL might be required.

next you loop in a routine with SELECT * from ....<your tables>  and write it to external files
the appropriate methods are in %SQL.Statement. 

what is the size of your DBs?
   ref:  ERROR #94: Total size of all databases would exceed the licensed amount.
   just gives a reason.
 could be there are parts you don't need at all.
you talk about ROUTINES - > 10GB of routine sounds rather unrealistic.
So splitting routines from globals  might be a useful exercise.
In addition the size of Db does  say nothing of the size of the content. 
some GBLOCKCOPY may help to shrink the DB.
And as you write Cache.DAT why not do it on Caché if you did this before ?