Should you stick with one version for all campaigns (so either HD or AoC).

Or is it possible to use AoK partially. While AoK is terrible to handle in some aspects, it saves 5+ min on Barbarossa, especially Henry the Lion with the glitch.

If possible, how to handle switching between versions midrun?

Changing the versions would be very neat. In the HD version for example the city of askalon in the 5th saladin mission has gates, while in AoC there are none (it's a huge time difference obviously). Also in some missions of the HD version, the AI behaves different and ruins your strat. Still both versions have their advantages, which should be used to save time.

I have no clue though, how to handle the switching of the versions.

I also agree switching versions would be awesome for a all campaign run.

Is it possible to run both versions at the same time and alt tab between the two versions between levels? With also having a timer onscreen to help with legitimacy?

IMO for single-segment full campaign runs, the version should stay they same. Would there be loading of pre-saved missions or selected through the menus?

Unless you're referring to individual campaigns for All Campaigns, which then it just becomes schematics. Arguably you're not really running the same game anymore by changing versions. It'd be as if you change NTSC and PAL cartridges midrun to beat a different portion of the game.

You select each mission through menu, they are all independent.

Don't think switching scenarios is really that great, but kills an option to play AoK since it doesn;t have the expansion campaigns. Could seperate this to 2 categories maybe.

About 5th saladin mission, this one is kinda surprising. The triggers and AI script are all the same and just copied (afaik) Nothing says anything about deleting gates, so it is a difference in AI behaviour itself that deletes gates.

I don't think you should switch versions within one run.

I did that with Voices of Babylon in AoE1 and it just felt super dirty, so I beat that run and deleted the old one from the site. I'm not sure what it is, but I just think that switching between two completely different game versions like that mid-run is not right. I did switch between Rise of Rome game versions mid-run in All Campaigns (to avoid the annoying save glitch and so that the last campaign is playable) but if it's not a gigantic pain in the ass it'd be better not to switch.

I did have the idea for having categories like "All AoK Campaigns" and "All Conquerors Campaigns" ages ago, if any of you are willing to run something like that then it definitely could be added.