Load balancing Availability groups with SQL Server Standard
I kind of like your idea, although it defeats the idea of a primary and second nodes. You should be sure to evaluate if one server can take the load of both, as if one goes down, then one server will have all the load.
You should also be careful, if the activity on one server gets to high in time, it might affect the "seconday" node activities and cause I/O bottlenecks. (It all depends on how your disks are confugred.)But other than that, it could be a good alternative and when your organization gets bigger, you will be able to afford another server to remove some load from your current setup. Just make sure to review carefully your emergency scenarios and to test them well.