Basic Or Pro: Can your plugin help with this shipping scenario

Greetings,

I’m looking for some very specific functionality from a shipping plugin and I’m curious to know if any of your plugins can help. I have one shipping class of items in my store that need a flat shipping fee charged per item. I have a second shipping class of items that would need to go through a standard USPS calculator for zip code, weight, etc because the items in this class can be packaged together.

I can get both scenarios to work fine except if I put an item of each class into the shopping cart at the same time. When I do that I either end up with the shipping plugin doing a flat rate per every item in the cart with no USPS options (first class, priority, express) or if I make some changes, I only end up with USPS options and no flat rate per item charges for the relative shipping class items.

Is it possible, if a customer tries to purchase 1 or more items of each class, they would see in their cart:

Flat Rate Class Item: $8.00 * [qty]

Other Items (customer selection):
First Class Mail: <amount>
Priority Mail: <amount>
Express: <amount>

Does all that make sense? Thank you in advance for any insight

Louis