Yes, that would work - you can do it pretty simply, you don't need to change a lot there - see pic
You would be limiting your recharge to 20A - theoretically you can charge faster if you went up - 40A or 60A
You may even consider eliminating the charge divider, I believe you can put this...
Again - the details are the hard part. What type of "dedicated controller"?
I would call the guys at Balmar - they are pretty helpful.
https://balmar.net/balmar-technology/multi-stage-regulation/
The challenging thing is that it may require a new alternator, which can get $$$...
The...
What are you trying to accomplish?
When you say LiPo I assume you really mean LiFePo4 (Lithium Iron Phosphate)?
If you're trying to just replace your house battery with LiFePo4, then I think you can just swap it out as-is (and don't change anything else). I would verify the charge profiles of...