The backhoe boom is almost certainly a better crane but the problem youæ±*e likely to encounter is you can稚 transport much weight with the stabilizers up without tipping backwards.
Just as others have shown, you can rig up a stinger to attach to the bucket. I rigged this one up to put a safe into my house. As was mentioned, you need to go very easy on the controls.
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If you plan to fab something for lifting higher, have you considered fabbing something for the backhoe rather than the loader? Your BH's loader and arm will be more rigid than whatever you extend the loader with. And you'll have east/west truss tweaking.
I can't see my BH having enough vertical reach to make any meaningful difference. Maybe a real BH would.