Unfortunatelly devices like DSL-N14U and DSL-N16U are MediaTek based, not Broadcom which the developed code can be ported more easily.
It can also be done obviously on MediaTek, but it would require tons of work/testing/debugging and literally starting from scratch.
Padavan is the right person to work on those devices, since all his developed code is based on MediaTek.
DSL-AC68U is already supported and GT-AC5300 will also be ported once I have a unit, both Broadcom units.