Dear Victron!
I am an electrical and mechanical eng with a small family ltd. I am designing and building lots of victron systems for RV and offgrid some ESS too.
I am building a lot and big fan of Double conversion systems!
Meaning for grid or Genset there is only a dedicated AC charger for the offgrid side there is a multiplus (due to AC couple I am only using multiplus II )
This is a MUST in HU cause the local rules not accept the victron inverters as grid connected…
Also for cheaper offgrid systems I inculed smalll 800-1200W ac chargers for small petrol genset where there is usually a 5000 or 10kVA inverter. A small 2kVA genset is working perfectly with an ac charger but not with a 10kVA multiplus sometimes even with weak AC support.
So MY
MAIN request is be the superheros as you are 
and build a nice 600-700W IP43 48V (maybe 12amps?) charger for us in HU!
I mainly use meanwell products for this purpose from 1200 1700 3200W versions.
There are systems where I install several!
Just this year I installed more than I can count…
Thank you!
