Additionally, it would be helpful if you could select your passports, and then it would suggest on a per-country which passport to use for entry, based on visa

Additionally, it would be helpful if you could select your passports, and then it would suggest on a per-country which passport to use for entry, based on visa restrictions, costs, etc. There are a number of websites that offer the information listed in the post, but nothing that provides the details I just described.