Yes and no. To clarify, 10 connections on a license key is the minimum for the BYOL licensing system. It's important to note here that any value higher is possible, but lower is not. For example you can buy a license key licensed for 11 connections, or 35, or 524, and so on. But a value lower than 10 on an OpenVPN Access Server BYOL type license key is never possible. So if you intend to buy a license key for 10 connections and then ask us to split it up into 2 license keys of 5 connections each, that is not possible.
However, on Amazon AWS it is possible to use the Amazon AWS tiered instances licensing system and one of the instances we offer on the AWS Marketplace is available for 5 connections. It also comes with a 7 day free trial giving you the option to try the product out before paying software licensing costs. Please note that on Amazon AWS costs do apply for running an AWS instance.