Help with Wall mounted Water Sandstone feature needed

Hi all

I have a just moved into a house and have a sandstone water feature which is cracked and leaking.

There is a pond underneath and the water flow is plumbed through a pipe that is in the rendered wall behind it.

I will upload a video of what happens when water from the pond underneath flows through.

I have undertaken search to find a replacement plate with no luck. I have also exhaustively searched for similar coloured pavers, to no avail.

The crack is fairly clean and I am hoping i can remove the feature from the wall and epoxy the cracked wall plate and replaced and have a few questions about this process

1) Is the wall plate repairable?

2) How is the lions head and wall plate be fastened to the wall?

3) What would be the best approach to go about dismantling the feature trying to preserve it?

Ultimately, if the wall plate cant be fixed i could live with the cracked in tit but would like to the fix the water feature somehow.

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Thanks for any help in advance