I have never used Tealium but see if it has a similar function to DTM where you create a new instance of a code master file(associated to your DEV rsid). Then assign it to just those pages you want reporting to dev.
In DTM you can even create subdomain rules that say
If URL contains(dev.www.com, stg.www.com) then RSID = stg RSID.
Similar function in Tealium?