Show product only if specific coupon entered

I am trying to set up so that at coupon code determines the product offered.

I am setting up a signup page to use multiple pages. Page one is just a place to enter the coupon.
When the go to the next page I want to only show the product associated with the coupon.

Use case: I offer different variations of a product through a few different distribution channels (slight customized for each distributor. So when the customer signs up, by asking for the coupon on page one, I can present the product associated to that distribution channel.

Any ideas how to accomplish this?

PHP page outside of aMember that is basically an introduction/welcome page for your site with a space to enter the coupon/recommendation code?

Once entered this then redirects to the correct signup form showing appropriate product.

Thanks for the idea. The codes are all 1 time use. So would still have to api or something to see what product the code works for and direct accordingly. This is a bit more than I can really take on. Was hoping for a solution within aMemeber

Just to finish this thread, I contacted support and they did create a custom plugin. It worked perfect and we very reasonable. This was also completed within a very sort period of time. You guys are awesome.