Tween town - Don't know about 09 ILS CAT III capability but they may also need to install supplementary approach lights (red barrettes for inner 300m) which would be a significant added cost to the TDZ lights. Not sure the business case would add up if 27 can already be used for CAT III.
Presumably they have to resurface the runway because of traffic and weather elements over time causing increased surface deterioration and increased maintenance costs to keep the surface safe. Like any airport in this situation they would have discussed well in advance with both cargo and passenger operators to agree the best timings for possession of the runway to do the resurfacing work. I'm sure not everyone is happy but runway surfaces, just like roads, do need rehabilitation over certain time periods. If
not then they become unsafe and for aircraft operations this is not an acceptable situation.