Can I use another brand of LED driver with IKEA lighting?
I can only answer this question as if I were a contractor. In general we order the drivers and material approved by the manufacturer. Meaning I would stay with the original equipment. If you choose not to use there approved equipment then it might cause damage to the entire system and void any warranty you may have for replacement. As a contractor I would recommend you stay with the original equipment or sign a release that we were not responsible for any damage and you understood that you would still have to pay me for the work performed.

Would you feel comfortable entering an agreement like that?

If you are wondering if the manufacturer would approve a different driver. You would have to see if they have them listed on their web site or call their Tech Line.