Hi. Given that you are using IV, which is much easier than V you should probably go
here and add in these missing BGRIV-E files which contain some high difficulty features that are not included in the version of IV that is in stainless steel 6.4 by default.
BTW, the 5000/10,000 crusade cost feature is just to join (personal money cost and treasury cost), not per turn as you suggest in your video.
The main financial costs you need to worry about for movement relate instead to the foraging damage cost system when marching across your own territory.