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I’m not an expert but maybe a bit of shuttering ply at the front presuming it’s going to slump forward, a bucket and float trowel/pointing trowel.
Maybe an old brush to wet/PVA what you are going on top of.I used mortar/SBR for holes round a window frame and mortar to build up a corner of a bathroom floor
Readymix mortar and SBR Admix?