I take the MicroSD card from the camera, and pop it in the tablet. Lightroom takes care of RAW post-processing and conversion. The tablet's Wi-Fi and SIM card take care of connectivity.
This is a simple yet complete system that does not rely on Wi-FI, but can exploit it if it exists. The tablet is lighter and smaller than a laptop, and the AMOLED screen great for color accuracy, contrast and viewing. No need for dongles, cables, or slow wireless transfers from camera to editing/conversion device. Pop the card in, and you're ready to go.
While you have eliminated the dongles, you also eliminated your backup space. I would suggest leaving your micro SD cards in the tablet and using them to store a backup copy of your photos. Get additional cards (SD or micro SD) for use in your camera. A USB OTG cable plus an SD or micro SD reader are cheap, simple and small. Once a day, or whenever appropriate, copy the photos from the camera card to the tablet card. This route keeps your photos in two places at all times for safety. It also allows you to have both devices active simultaneously. For example, shooting food photos while uploading at an Internet cafe.
Personally, I always get annoyed whenever I need to insert or eject a micro SD card into my tablet. My nails are too short and fingers too fat to eject the card without using a coin or key or some other tool.
Yes, that is also an option with this eco-system. I have toyed with that idea too, and I already have the USG OTG cable. This eco-system affords that flexibility.
I've done two month-long tours in the last three years (One month in Vietnam, three months in Iberia), and other multi-week jaunts in Southeast Asia, without backing up, or running out of capacity. No problems. No need for advice, really. Personally I do not want to be spending any time at an internet cafe, or uploading. The eco-system I propose is field-tested.