That arcing is on the secondary side of an isolation transformer, AFCI shouldn't directly respond to it. The disconnect isn't for the cook, it is for anyone servicing the appliance. Does everyone servicing the appliance use it? Maybe not but is there for them.
GFCI only required for receptacles serving counter tops or within six feet of a sink in a dwelling kitchen.
First, GFCI not required on this receptacle, unless it also serves a countertop or is within six feet of the sink, and even that may be considered to be behind a barrier (the range) and not required to be GFCI protected.
But removal or bypassing of GFCI's because they are tripping isn't something I generally do without serious consideration first. First question is why is it tripping? If it worked before and suddenly started tripping, something likely has changed. One of the most common places I get requests to remove a GFCI is for pond pumps. 99.99% of the time I always find there is a ground fault and the device is doing what it is supposed to do.
Had a customer once tell me the freezer in their garage kept tripping GFCI and the appliance guy told them they needed to eliminate the GFCI. I found a fault in the freezer and even narrowed down the faulting component and told them to get the appliance guy back and what to look at.
If you just eliminate the GFCI and not find out what is really going on you are setting up for situation of potential shock/electrocution, which if aren't bothered by potentially injuring or killing someone is still kind of counterproductive when it comes to making money, with the potential lawsuits and bad reputation you may get from that.