This all depends on a number of factors...
Can you swap movements and dials yourself? Do you have the tools?
option 1 - If money is no object, then sure, buy a chronometer grade ETA and have it installed with a white MBW or Yuki 1665 dial etc etc.
option 2 - If you dont plan on spending a lot on this project, and you dont have a lot of experience working on mechanical watches, then the Puretime 1665 swap is a great idea. Take the "guts" out of the PT and toss them into your MBW. Attach a gen crown while you are at it, and you are good to go. No messing with reinstalling hands and aligning datewheels etc. Then sell off the PT case and bracelet to recoup some of the costs.
option 3 - buy a Yuki dial or a used MBW great white, take your watch to get serviced and have them swap the dial at the same time. As for the date font, overlays are readily accessable, but a lot of watchmakers wont install them because they are a pain in the butt to align.
Option 2 would be the cheapest because you can sell off your existing movement in your MBW, the 1665 PT case and bracelet and your double red dial and end up recovering most of the $200 you spent on the PT watch.