Suggestion: Apply filters to existing frames

My work flow for a time lapse is to shoot on my Canon T5i using an intervalometer(*) and drop the individual images into a project.

However, it can be painful to set filters (such as image and tilt shift) that way, because those tools are oriented around a live feed, e.g., they use the built-in camera.

It would be great if you could either load an individual image to experiment with the filters, especially tilt-shift OR add the ability to apply the filters to frames already in the timeline.

(*) Actually, the intervalometer built into Magic Lantern. I do this because I don’t always have my laptop with me, and because the minimum interval with a direct hookup (the one time I tried) was about 20 seconds and I had a lot of problems.