I just bought one for our camper when out bush camping. I went with a Liitokala Lii-S2, its USB powered and does both NIMH and lithium but it doesnt fit your D requirement. I like the display on it you can see the batteries current voltage and how many mah has gone into but im not sure how bright it would be charging at night it will probably need something put over the screen.
I specifically chose a USB/5v charger as using the inverter is inefficient, i have a 600w “Giandel” charger and just to switch it on with no load on it uses over 1 amp. One of those standard car usb chargers is much more efficient.
Now I realized that some chargers (f.e. my Zanflare C4) are actually 12V chargers with a separate power brick. I believe there would be more models like that but they will probably not be advertised as such. And you may have to produce your own cables for them.
Hobby chargers also typically accept a wide range of input voltages and should work for you, though it’s more…for a hobbyst really, unless you know you want one I wouldn’t recommend that you go this way.
BTW, I realize that small efficiency improvements add up but I really can’t help but wonder if you use up enough batteries to make this consideration something worthwhile.
A lot of chargers run off 12V and the AC adapter simply converts the local power to 12V DC and 1-3 amps.
Perhaps people would be willing to look at their charger’s bricks and tell you if that one is 12V or not.
Mine are all ancient and probably no longer in production so not sure if mine would be of use to you but my Liitokala and Xtar chargers are both 12V in.
Also you can look for chargers with cigarette adapter which will indicate that it either runs off 12V or you an plug the adapter in and it will run off 12V.