[CB..]

there should be enough there to attempt a test campaign Col.....now it's my guess that if you edit the la spezia base in the LND file to this

[Unit 34]
Name=Singapore
Class=NavalBase
Type=407
Origin=British
Side=0
Commander=0
CargoExt=-1
CargoInt=-1
CfgDate=19380101
DeleteOnLastWaypoint=true
GameEntryDate=19410801
GameEntryTime=0
GameExitDate=19430627
GameExitTime=0
EvolveFromEntryDate=false
Long=12460910.000000
Lat=153120.000000
Height=-17.000000
Heading=180.000000
Speed=0.000000
CrewRating=3
DelayMin=0
ReportPosMin=-1
ReportPosProbability=100
RandStartRadius=0.000000
NextWP=0

and fine tune the start point for the dock..

then selecting la Spezia on the start campaign choices will have you appearing at singapore....and returning to base should allso have you back at singapore (or whatever) depending on wether the stock player bases are tied to the UNIT numbers in the LND file or listed else where...im sure they are listed else where allso so perhaps little more is needed

if so then all it needs is the shipping added to the RND files etc and off it goes.....the patrol grids are listed somewhere allso but i dont think these could be altered tofull lat long co-ordinates (there not being krieg grids for the pacific AFAIK) but as the patrol zones are not compulsory altering the renown settings to compensate will by pass any inconvience there...