Xero Legacy Tidy up for Multi Currency (small) NGO

I need a qualified accountant used to working in multi location, multi currency environment, expert on Xero and ideally the NGO / non profit sector to sort out a 7 year old legacy issue with the way our projects have been recorded on Xero. This is a time bounded project requiring excellent attention to detail working with our reporting accountant (one of our trustees) and our finance manager.