Orange removing the cat will have no I repeat no negative influence on the management.
With the extreme heat you had before the matrix in the cat melts (for lack of a better word) causing a obstruction which will cause a lack of performance and a lot of other symptoms in the end resulting in head damage and probable manifold damage as well.
Before you remove it we can not advise on the other symptoms.
Just unbolt the cat. Take a hammer and long chisel or anything ells you have lying around and break the matrix out of the cat. With that done put the empty shell back. The car will be a bit more vocal with a bit of a metallic sound from +/- 3000rpm and a lot more power.
Disconnect the battery for 45m or longer, reconnect the battery, switch the car on (don’t start just switched on) for 40secondes, switch the car off for 40seconds and then start the car and let it idle for 15m after which you take it out for a spirited drive. This will reset the learning curve and allow the ecu to learn new habits.
GTV V6 Turbo, Q2, Eibach, Koni, and lots more
916 2.0 Spider what have I done
Triumph Trophy 1200 to counter the fuel prices.