They made a transition piece for FT to tubular at one time. I'm not sure it's still available. Lining up the two butted with both screwed down, and shimmed to height should work if you have some old track. Id try to reshape the tube track ends a little to square them to match along the inside so flanges don't pick and climb there. Old tube track is cheap. You might even find a few for free. (check for sale section. And or "free" in advanced search and "if anybody want's/needs some" in posts.
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