They won't do it unless they are building a PC for someone with same mobo when you inquire.
Converting to WiFi & inbuilt WiFi mobos are different. B650M PG Lightning will have the antenna ports wired to the M.2 card. The pics I posted clearly shows the antenna slots in I/O shield & the manual posted by
@YeAhx confirms them + the installation process. My mobo came with wire pre-installed between M.2 card & antenna ports.
Honestly, rest is upto you but my recommendations will continue to be MSI B650M Gaming WiFi for 10k or B650 Gaming X AX for 16-17k. Save money with former mobo or get a good B650.