I am neither an extensive boon docker nor an owner of a RV with a residential refer.
But.....it would seem that a 12' side by side type gas/electric refer conversion on the target unit would be a $3K to $4K cost if the Dometic refer was purchased new from PPL RV. (Norcold seems to have too many issues.)
Dometic RM 1350 Elite @33" wide $3,150 plus shipping and tax at PPL. Another $100 in parts plus labor gets to $4,000 easily without considering cabinet rework.
Only you can determine if peace and quiet is worth the cost.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs