Wanted to make a thread about sweet potatoes too as I eat 2.4 kg every day so I'll hijack this a bit while answering you.
Regarding oxalates, I eat a lot of calcium (1600 mg) to make up for this and also drink a lot of water in order to urinate a lot. As far as I understand, this would be enough for oxalates not to be a concern. By my calculations, I get 350mg of oxalates per day.
My concern with sweet potatoes, however, is the high glycemic index. What's the verdict on this? My sweet potato meals are always 800g - 1kg and I eat them with some chicken and 40 grams of olive oil. I slow cook my potatoes. Would it be better for the GI if I boiled them?
Right now, with my current diet, if I were to remove sweet potatoes I would not get enough of:
Biotin
Vitamin b2
Copper
Iron
Magnesium
Mangan
Zink
Is there anything I could swap out sweet potatoes with to easily cover this?