Pre-make a Dunder like wash?

[TxBrewing]

First, thanks for all the amazing information that is posted within these forums.
I am still reading and will continue well into this journey.

While I admit, my "search-fu" is week Grasshopper, I have looked and as of yet, not found what I am looking for.

I am in the process of researching and developing my method for making a Rum, so far both SBB and Buccaneer Bob and most all Rum process I have come across advocate for using Dunder. I also know that like running a UJSSM, the first generation can be accomplished without the backset, and that many of the recipes say that the 1st gen of Rum is fine without as well.

Seeing that the Dunder is just a spent Rum wash, left to "age" I think a small batch should be able to prefabricated.
In my mind it is as simple as making 1 or 2 gallons of molasses wash, fermenting it out, boil the "heck" out of it after fermentation, then let it sit for a week or so prior to starting your first run.

May not be a 100% solution, but in my simple head, seems like a step in the right direction.

ALL input is welcomed and wanted.

I am going to run some Rum this season, I hope to have my double thumper set up soon.
Then I will have a whole other set of questions.

Thank you all

T