woodsmith
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I'd try using a bolster and chisel first as the material may come out quite easily if not you would need to use an angle grinder with a diamond blade. You can get wide diamond blades specifically for removing mortar but I would try a thin blade first. The big problem with them is cutting into the surrounding paving and making more of a mess than you have now.
If you are going to use Geo-Fix then follow the instructions to the letter and you should have no staining. If you use cement/sand mix make sure the paving is dry and mix the mortar to a very dry consistency with just enough water to loosely bind it together, then brush off any overspill with a dry brush sweeping diagonally across the joints.
If you do use a grinder make sure you have a good mask, plus ear and eye protection.
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