Latvian and Marshallese Ad Hoc Report (cedilla and comma below)

Marshallese uses the letters L/l, M/m, N/n, and O/o with cedilla.

The Ad Hoc http://www.unicode.org/L2/L2013/13128-latvian-marshal-adhoc.pdf
concluded that encoding
LATIN CAPITAL LETTER MARSHALLESE L WITH CEDILLA
LATIN SMALL LETTER MARSHALLESE L WITH CEDILLA
LATIN CAPITAL LETTER MARSHALLESE N WITH CEDILLA
LATIN SMALL LETTER MARSHALLESE N WITH CEDILLA
would cause the least architectural disruption and would be the best
way to proceed.

How can that be the best way?
How would one rationalize using one diacritic U+0327 with M/m and O/o
but not with L/l and N/n in Marshallese?
A single combining diacritic to use with Marshallese L/l, M/m, N/n and
O/o would be easier to deal with.
It would require less new characters to be encoded and would make it
easier to support in fonts (adding 1 instead of 4).
It would also be easier to implement on keyboard layouts (same
behaviour four all Marshallese letters with cedilla instead of 2
different behaviours) .

--
Denis Moyogo Jacquerye
African Network for Localisation http://www.africanlocalisation.net/
Nkótá ya Kongó míbalé --- http://info-langues-congo.1sd.org/
DejaVu fonts --- http://www.dejavu-fonts.org/