I have used clean and strip disks and they get real hot real fast. Even that UK site says to use paint stripper first otherwise it will get too hot. If you dont want to use stripper then a sander produces less heat but is slower.
With a flat door the slightest heat distortion will show up, or take ages to block back.
Depends how fussy you are about the finish I guess.
For me the safest for your panel is chemical stripping. Take them outside and wear a good mask - no probs.