Got 3 companies you say one , the hub maker spokes and rims are 2 more manufacturers ..
IDK what the distribution is between Taiwan where a Lot of bike stuff is Made and Cambodia where you are ..
Sturmey Archer is Now a Taiwan based, division of Sun Race.
Over here, In spokes , Belgian Sapim, And Swiss DT sell well . as premium spoke brand names .
There are companies that will combine the parts to make a wheel ..
though doing that is also a job an individual can do by hand ..