Renovation of 206 cc Roland Garros seats

Hello, I want to renovate the seats of my 206 cc Roland Garros phase 1.

The seats are made of two materials: the rear and lower parts are made of leather, but everything else is made of leather. My problem is that the previous owner tried to repair them but did more harm than good (see pictures).

On the passenger seat, a hole was cut methodically to (I imagine) stop the tears in the leather, a piece of cloth/vinyl of a neighbouring colour was more or less glued inside. Scars and scratches on the sides of the buckets and other areas are present.

On the driver's seat and I think most of the work will be there: a cutout has been made on a complete leather strip (at the seat level), I don't see how you can glue a piece of leather and make a seam there? Do you think it is feasible to repair both seats?