Yes, the real problem is to find testers with a flasher. In any case I suggest to try first on NOR consoles, then test NAND when the code is polished. Even if it was proven to be "safe" all measures that prevent potential bricks are welcome.
In wMM I developed an experimental software flasher of wMM (which is currently disabled due it hasn't been fully tested).
https://github.com/aldostools/webMAN-MOD/blob/master/include/cmd/ros.h
https://github.com/aldostools/webMAN-MOD/blob/master/include/feat/rospatch.h
Some of the checks that I implemented are:
1. NAND / NOR flash type
2. Applicable Version must be 3.56 or lower
3. The system should not be already on CFW
4. nofsm patch file must exist with a size of 7MB (7340000 bytes) / detect it in root of storage devices
5. MD5 of nofsm patch file must match current FW version
6. Ensures that metldr is not metldr.2
7. Writes minimal patch by default (5.5MB = 0x2C80 sectors) (can write full ros with ?full)
8. Verifies that current ROS is valid
9. Verifies written data (full mode only)
10. Both ROS are written (can be forced to write a single ROS using ?ros0 or ?ros1)