Jellyfin clients capable of "unscaled" progressive output?

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So...can I ask, since you are very particular about this...why haven't you found a filter and process to de-interlace and upscale these to your liking and provide those while preserving the originals? That would be the ideal -- have an "HD" copy that's pre-upscaled and de-interlaced meaning the client doesn't need to do any post-processing, you've already done it. You get to handle everything. You could run it through VapourSynth or just figure out the ffmpeg options to take care of it to your liking.

I only ask because forcing specific bounds on transcoding is not particularly feasible. A lot of this is dictated by client device profiles as well as compatibility. So whatever a client says it will work with, the server sends. If the client decides it's going to upscale after the fact, the server has no say in the matter.