For the shige flavours, you should ask Shiraishi-san. She is the expert on shige related matters.
Now as for the ship...
I give you permission to assemble a team to salvage it and you shall have the funds you need to get the job done.
You raise a good question regarding the movement of the derelict. If towed towards Kinkaku-ji, you would need to cross open space, at least the short distance between Seiran and the Hayate Dust Field. To minimise the chance of detection, we would have to outfit the derelict with a rundamentary form of cloaking technology. It doesnt have to be rendered invisible, but at the very least to hide it from enemy scanners. With the derelict in tow, the speed will be at a crawl and you would be sitting ducks when detected.
Which is why I would suggest bringing it to Ainu first. There it can be prepared so it can be transported to a more specialised station like Kinkaku-ji while minimising the risks. If you need help from Malta, ask our good friend Chenzo for assistence.