17000x30000 jpeg images really slows things down

gday all.
I'm doing deep zooms on still images I've added text to, and to maintain text fidelity at 50x zoom I use large image sizes. Davinci is meant to be resolution independent but I've found even with the larger timeline resolutions any transforms applied to media seem to rasterize it at the timeline resolution.
Fusion doesn't have these issues, I haven't found the upper limit on what it can accept, but it really struggles with the filesizes. Playing the media it gave up on fps and now gives spf, and rendering a 10 second clip to DNxHR takes 3+hours.
Proxy and optimized media don't seem to help when it comes to still images.
I'm wondering if there's another way I can do very deep zooms into still images without compromising the resolution of the original media?
I'm doing deep zooms on still images I've added text to, and to maintain text fidelity at 50x zoom I use large image sizes. Davinci is meant to be resolution independent but I've found even with the larger timeline resolutions any transforms applied to media seem to rasterize it at the timeline resolution.
Fusion doesn't have these issues, I haven't found the upper limit on what it can accept, but it really struggles with the filesizes. Playing the media it gave up on fps and now gives spf, and rendering a 10 second clip to DNxHR takes 3+hours.
Proxy and optimized media don't seem to help when it comes to still images.
I'm wondering if there's another way I can do very deep zooms into still images without compromising the resolution of the original media?