During the first investment cycle (end Chapter 1, start Chapter 2) there are three investments offered where it is impossible to have enough ProN at the time--a newly opened mineshaft (I'm guessing the same one that Aka and co. screwed with on her route) and core lendership for the banks in Yhilin and Stineford.
All three have the standard accept/decline player response, rather than automatically being rejected with dialogue. If you used a save editor to give yourself enough money, would it be possible to buy these investments? If so, do they give any kind of return?