I think a lot of this is over-complication. I have a box of batteries at home, mixed Energizers and DSE brand (orange and green), all NiMH, mixed 9v, AA and AAA. I have two five year olds, so the batteries go into doorbells, cameras, remotes, firealarms, toys, toys, toys, torches etc. all requiring 1.5v in various multiples. I am aware that the rechargables are only 1.2v. I have an Energizer recharger that came as part of a bundle. I haven't replaced or thrown out a battery in some years, literally. On the box of batteries, I have handwritten:

Only charge in matched pairs of similar strength.
Never mix strengths of batteries.
Only use good batteries in matched pairs (strength, brand and model).

Can't say I've had a problem with any electronic devices and I haven't had an urge to go out and buy alkalines or 1.5v batteries. The fire alarms go all the way to the DST change as recommended (I do test them about every other month) and the remotes, doorbells, remotes toys etc seem to last months on end.

I'd say - go for something midrange and manage the charge cycles well. My kids enjoy using a simple battery checker and 'hunting' for low batteries, then charging them.

Good luck.