The usual resistor material is a NiCr alloy and is very hard (nearly impossible) to solder. In most cases some kind of spot welding is used for those wire wound resistors.
Low ohms resistors sometimes use Manganin (CuMn) or a similar copper based alloy that is relatively easy to solder, but more sensitive to higher temperature and less stable over time. With low ohms the connection gets more critical and thus the preference for a material that is better to connect.
The 720 has methods to do a fine trim an the resistors. So if the resistor is broken at one end, which is likely point of failure, it should be OK to repair that resistor even if the wire gets shorter by some 5 mm. Soldering / welding would effect mainly the first few mm and thus only a small part of the resistor and should thus be acceptable. The original resistors also have the ends treated in a simular way.
The parasitic inductance would not matter very much, but low inductance also does not hurt. The construction with seprate winding chambers also helps to keep the peak voltage seen by the wire insulaton small. Than changing the direction is only a small addition.