If its like most, then their is angle iron that supports the square tubing that the fence rail is bolted to. That angle iron attaches to threaded holes with a bolt to the cast iron top.
Anything can be done with enough time, money, and knowhow.
I suggest going on youtube and watching some videos of people upgrading their old table with new fence systems. This will give you an idea of what all is involved.
Personally, to me, you should not have to do this on a brand new cabinet saw.
I know this is not what you want to hear, but Ive been down this sort of rabbit hole many times, so I speak from experience.
You would better off to save up a bit more and buy the saw with the right hand cut capacity you want.
If you want to modify a table saw to meet your exacting needs, then buy an old saw and upgrade that.
But make no mistake, unless you have square tube and angle iron just laying around you will spend a fair amount of money either purchasing the raw materials, or buying a fence kit.
Here is a kit from Shopfox that has a 54” right cut capacity
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