Getting bolts loose: If you get a bit of movement, work each bolt back and forth just a few degrees, adding penetrating oil. Don’t try to unscrew more than a very few degrees without working it back towards ‘tight.’ The range of movement will slowly increase. PATIENCE!
Oil filter: Perhaps others who have used the Burr Ripley filter conversions can comment, but I think that is the way to go, since you will not have to re-form the existing lines or make new ones–which you’d have to do if you put a generic replaceable-element canister on. By the way, if your replate those oil lines, they should be polished nickel, not chrome.