If you contribute post-tax earnings its usually a very simple event. Depending on your ownership stake, you have some information reporting, i.e., Form 5471, Form 926, but that's about it. If you don't have to deal with Form 5471 because you own a very small stake in the company, you'll want to have an accountant look into PFIC reporting, especially if the foreign company is engaged in "passive" activities like renting, licensing, investing, etc.
People are scared of Form 5471, but it's really not a big deal. It's also not very expensive, in the scheme of things. If paying roughly $100-$250 for a Form 5471 is too great an expense, you probably don't have the financial leeway to be making the foreign investment in the first place.
Also, Translating accounts is not very difficult. You simply apply the appropriate exchange rate (the average rate, or the year-end spot rate, depending on whether you are translating the income statement or the balance sheet). It takes at most a few minutes if you use any sort of organized accounting system or software.