If you need a different / bigger fighter, then modifications have to be done. Either go for the already in production delta canard j10 which has better high altitude performance or design a new fighter from the ground up which will cost a lot of money in R&D
The cranked-arrow wing shape in F16XL provided better low-speed lift and handling characteristics than the modified "double-delta" wing used on the other SST.
The design of the cranked-arrow wing was a cooperative effort of
the General Dynamics Corporation and the NASA Langley Research
Center (LaRC). The cranked arrow wing, common for both the F-16XL-1 and F-16XL-2 versions, was designed to provide the F-16 aircraft with improved supersonic performance while maintaining transonic performance that was comparable with that provided by the current F-16 design.The resultant design had a leading-edge (LE) sweep angle of 70 deg inboard and 50 deg outboard of the crank. At the juncture of the wing leading edge with the fuselage, an S-blend curve was placed in the leading edge to alleviate a pitch instability that was found to occur at high angles of attack in wind-tunnel tests and wing-tip missiles installed.
NASA Armstrong Fact Sheet: F-16XL Laminar Flow | NASA