The most easily available routers in Ecuador with detachable antennas are the TP-Link 841HP v5 and 941HP(UN) v2. Any chance of compatibility with LibreMesh?

https://wikidevi.com/wiki/TP-LINK_TL-WR841HP_v5.x
CPU: MediaTek MT7628N (575 MHz)
FLA1: 8 MiB (GigaDevice GD25Q64B)
RAM1: 64 MiB (Winbond W9751G6KB-25)
Stock bootloader: U-Boot
Stock FW OS: Linux

I haven't found technical specs for the 941HP(UN) v2.