I've thrown together an online tool based on the tplink-safeloader to convert TP-Link firmwares to sysupgrade-compatible images so that people can more easily return to stock firmwares from OpenWrt.
It's available live at https://argsnd.github.io/tp-link-stock-firmware-converter/.
You can see how it works or build and run it locally at https://github.com/argsnd/tp-link-stock-firmware-converter/.
I've tested this on my RE450v3 and RE650v1, and it works well on both devices but as always caution is advised when flashing your devices. Looking through the tplink-safeloader source code should provide a list of which other TP-Link devices this tool will work for - it's quite a few.