I have removed three 1.5" waste pipes from a kitchen through wall to outside. I am wondering about patching up the external holes they have left: two of the holes were across two bricks of different courses - and one was across three bricks of two courses. I could remove the remnants of the bricks, carefully remove enough bricks from different places in a different and hidden wall - use them for repair - and put best match new bricks in their places.
Or : I wondered about mainly filling holes with mortar - and then finishing off with coloured mortar to match brickwork and old mortar.
Ideas or suggestions would be appreciated.
(Thanks for comments re Gas bayonet)