Import users / add membership

Hi,

we use Ubercart to sell membership for our (small) non-profit organization (www.groupe-traq.com).

We wish to manage our members through Ubercart/Views instead of using excel (print labels, renew membership for users without internet, payments by cheque, etc.).

Many members did not take the time to open their account. So we will use Feeds modules to transfer our member list from Excel to Drupal (may of them were born before the man on the moon... ;).

Unless I'm wrong, if we add users with feeds (including their role), they will not "appear" in Ubercart. Is there a simple way to :
> 1) add the end date of their membership using Feeds so that Ubercart will take this info into account?
> 2) to make Feeds and Ubercart work together in such a way that we have a new order for each added users with Feeds?

If not (or if its too "hard"), does this mean that we will have to "Create a new customer account" (Store > Orders) for each imported user (but I guess we could create such account when we upgrade a new user at the end of his membership)?

Thanks!