No, we do not intend on discontinuing the Swim Briefs at this time, nor have we been notified by the manufacturer that they are either.
Although you could wear Swimmates in combination with the So-Secure Swim Briefs, the Swim Briefs are intended to be used in direct skin contact.
The So-Secure Teen Swim Brief would help in your situation to prolong the amount of time between restroom breaks, depending on the amount of excrement released.
Sizing information is available in the product description.