What i mean by "your content won't be suitable for both competitive keyword ranking and building links" is that the kind of video you'll want to create and embed on an important keyword landing page is probably not the kind of content that people are actually going to link to. It's extremely rare to find a video that will serve that landing page well (likely by being fairly commercial in nature) and a video that lots of people will want to link to (by being useful, informational or entertaining). That's not to say it's not possible, but I have never ever seen it executed successfully.
If your goal is basically just getting these rankings so you can drive traffic that may then link to you - then yes, I would recommend using Vimeo Pro or similar (if you're using vimeo pro, Disable the community pass). If no-one is searching for those general topics on YouTube - it's probably not going to be worthwhile putting your content on there. You can test it, of course - but make sure that the metrics you're tracking are traffic from YouTube and engagement on the platform. It's easy to get swayed into thinking YouTube is useful because of high view counts - but views are essentially just "hits" and there's no way of knowing whether those views could have been driven to the version on your site instead.
When you embed the content, you'll also need to provide a custom embed code for others that includes a textlink back to your site - as the standard vimeo embed code will only link back to vimeo.com