I'm pretty sure these changes are great for e.g. standard TLS connections. But I don't quite understand what this means for other/custom curves. For example I

I'm pretty sure these changes are great for e.g. standard TLS connections. But I don't quite understand what this means for other/custom curves. For example I'm often using brainpool curves. Currently I just set the CurveParams and I'm done. They are part of a lot of official standards (especially in Europe/Germany but also for e.g. travel documents in the ICAO standard) so I can't get around them. Do I have to implement everything for that curves myself? That would probably be more insecure than just using crypto/elliptic.