Given that the equipment you’re working with is designed with UNbalanced signals in mind I think it’s a solid “highly unlikely” that you’d notice any of the issues mentioned.  If you’re nonetheless concerned, there are better ways to go from balanced to unbalanced (or vice-versa) than custom cabling.  See here for details: https://www.ranecommercial.com/legacy/note110.html and plenty of companies build affordable boxes that accomplish the task of balancing/unbalancing.