Just guessing out loud here, If it was me I would see if I could buy a stove top the way you want and sell or trade the other one since it is new. Maybe go to the maker of the stoves web site. To convert what you have to what you want may work but, what about resale value. If it does not look or work like a factory install it might lower the value and I for one would pass if looking at the trailer or make the dealer/seller put a factory stove top back into the trailer.
2013 24RKSWE (27ft TT) Cougar 1/2 ton series
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed 3.55 rear end lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.