Firedog,
welcome to forums and especially welcome to this thread , I knew it was just matter of time, another Eplus owner.
In general I like your ideas, but, but...
Before doing any conversions...
I would make sure my Eplus drive/kit/ works perfectly, if you have any issues like random cut offs, intermittent problems, loose, broken hardware , I would take care of it and try to fix.
First time I hear about it - Eplus display/controller doesnt show battery SOC /bars/ , you mean completely blank ,no bars shown????
Eplus SOC meter is a REAL meter of battery capacity, no voltage based meter/you saw those cheap useless throttles with 3 lights?/ . Eplus SOC meter uses Columb count to measure charge with precision. Before my conversion it showed remaining charge exactly .
So any problems with your Eplus drive as it is now?