Regarding difusers, have you considered using an organizer pouch (sometimes called an EDC organizer or field pouch) or travel cubes to keep your smaller items from getting misplaced or buried in the bottom of your bag while travelling?
As for dedicated lanterns not mentioned yet:
Fenix CL09 - 1 x CR123A or 16340. Very small. 4 white modes, plus red and green secondary modes. Magnet in the tail
Fenix CL23 - 3 x AA (but not 14500). Similar diameter as the Lumintop CL2, but shorter in height, and lighter weight, but plastic instead of aluminum. White light or red light. Can turn on only the the LED’s on one side for directional illumination if desired. Also includes a light on the bottom to illuminate downward when hanging.
Fenix CL20R - 1600mAH lithium ion. Built-in battery, but I figured I’d mention since it is similar to the Obulb but a little bigger. There was an older version (CL20) that used AA batteries and sounds like it would have been a really good option for you, but I don’t think it is available anymore.
Nitecore LA10 - 1 x AA (but not 14500). Very small. Magnet in tail. Diffuser can be telescoped down to further reduce size. Standard or high CRI versions.
Nitecore LA30 - 2 x AA and built-in lithium ion (can run on either). Magnetic base, high CRI, secondary red light mode.
Coast EAL12 - 4 x AA (not 14500). Simple and cheap, but not very compact. I’m pretty sure the output is not regulated, and it only has 2 modes.
Cascade Mountain Tech Lantern - 3 x AA (not 14500). Simple and absurdly cheap, especially if you have a Costco membership. This is the only one from my list I have tried so here’s a mini-review:
It comes very close to being a great budget lantern. Modes include: Daylight high and low, warm white low only, and red strobe mode. The illumination pattern is decent, although could be better. The diffuser can be removed to have a directional light good for hanging to illuminate downward such as in a tent or using as a very floody flashlight. The diffuser telescopes down to reduce the size for packing. It is mostly plastic, but still feels decently well built. Output is unregulated, but that’s to be expected for the price.
Unfortunately, the red strobe mode makes absolutely no sense to have included at all, and worse, the user interface forces you to cycle through all modes to turn the lantern off. If they changed this light to single click on/off, and hold to change modes, I would call this an excellent deal. It has nowhere near the features or quality of the BLF LT1, but for the price, the features it does offer have the potential to be a great value. Considering the actual UI, I can only recommend if you accept that you have to cycle through strobe to turn off. I could not accept this, so I returned them.