If you choose the Samsung strip, I would move to plm-40-350 driver. And you could run 4 of the sammy’s on it. Its basically dropping the current a smidge because the voltage on the Samsung strip is a little higher. Basically substituting a 9 watt bridgelux strip with an 8 watt Samsung strip.
Either of those you could probably grab a 24"x12" piece of aluminum plate from Ebay, then use thermal tape to stick the strips to plate. I have all the steps pretty well lined out in a different topic here