Have you looked at the Checklist plug-in?
You just set the tag you want and any checkbox with that tag is collected to a pane in the sidebar. Constrain to 6 if you want Ivy method.
I do a variation of this. I use Amazing Marvin for my deadline-driven must do tasks. But there are always the smaller ‘would be cool if’ or ‘read when you have a break between meetings’ type things that pop up in the course of my day and I find get in the way or are distracting in the middle of bigger lists.
So I’ll just jot a line starting with - [ ] #todo in the midst of whatever note the thought occurred and it will be in the sidebar list persistently. I don’t let more than 4-6 pile up there before knocking something off. If they become bigger I transfer to Marvin.