A different view on battery charging?

I know this has been done to death and I've read with interest the differing views on differring systems for charging aux batteries in 4x4's and campers.
Over the years I've had the Redarc solonoid version and Rotronics in different vehicles, both worked well although I replaced less batteries with the rotronics.
We are currently setting up a GU for some extended outback touring. The car has a Redarc and 2 dissimilar "deep cycle" batteries, one under the bonnet and one in the trailer.
I intend to install 2 AGM 90-100AH batteries parralled togther, as aux, one under bonnet and the other in the back of the wagon to run a fridge and the various bits we (she) can't do without.

MY QUESTION...

As we have a 600 watt inverter in the GU, would it make sense to run a 240volt, 30amp, 3 stage smart charger off the inverter to charge the 2 aux batteries while travelling?
I know there would be some loss of efficiency, but figure the alternator could handle those losses.
My idea was to also have some heavy cables joining joining the main(cranker) to the aux under the bonnet with a manual on/off swith inline in case the inverter or charger failed?
My thoughts are that the batteries would be charged completely(3 stage charger) and quickly (AGM) with enough reserve capacity for a few nights here and there.
I also already have most of the components so cost would be minimal.

Thanks for your patience!

What do you think???

Cheers Nifty.
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