If you were in the Uk, I'd say pop along to screwfix and buy one of these


https://www.screwfix.com/p/titan-ttb...230-240v/4172g

£65,

put the flat tool in and away you go

you will of course be able to buy them in Home Depot / lowes etc etc

Cheap large sds drill ( its not going to be massively worked )

one of these bits

https://www.lowes.com/pd/Bosch-3-in-...ng-Bit/1242637

you call them Scaling chisel it looks like