Hi! Welcome to our NS Community, akron. That's still possible. You do need to remove NS Flex completely through our customer service and pick up the deactivation at a ticket machine/loading point. After this you can order the Dal Voordeel season ticket here. Be sure to switch to 'on balance’ in the right top corner, before proceeding on this page.
In that case you do need to contact Customer service to remove NS Flex. After confirming on a ticket machine you can order Dalvoordeel, but this is for a year, with a price of €60,--, and you will be able to travel with a balance.
It is wise to order automatic reloading. In that case there is always balance on your card.
BUT-do realize it is the intention to scrap all remaining non-FLEX subscriptions asap- some say in spring next year. It will certainly be the case when the current chipcard system gets revised, but that may take a few more years.
There will be groups with no access to Flex because of a lack of creditworthiness.
They do need a facility to travel, e.g. Dalvoordeel with balance or TrajectVrij month, as there is now. Or an alternative.