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I do not think it will hold.
I think it would be like joining two pieces of concrete one wet to one that has aged and old. You need the rebar as a support and holder.
I think that it will INITIALLY hold, but with short time it will scall off and return to the old level.
When cer tile is installed, the grout is supposed to be concave shape between the tile. The handle end of the tooth brush is the tool used to make that shape.
There is NO flexibility to grout and if too high and no banks to contain it and support it, it will crack off.
Can you experiment on a place out of the way and see what happens.
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