How to remove the inner door panel on a gas oven?

Maybe somebody else could offer more specific advise on your particular model as I have no direct knowledge, but I'd suggest the fixings you are referring to may be pop rivets.
Pop rivets can be removed by drilling out the centre hole with a 4mm metal drill bit until the top becomes detatched and the rivet will drop inside. You will need to replace these rivets using a commonly available pop rivet gun and the correct size rivets. All very cheap and easy to use.

Rupert
July 2020