I use an older silver plated Amphenol 90° connector at the back of my HF radio, but you might not want to use a more modern nickel plated one for GMRS after watching this video where Jim does a reflection loss test on right angle connectors. Losses are almost nothing for the silver Amphenol ($$$) but high for the average run to the mill nickel plated connector, especially at higher frequencies. If you decide you want to, get a good one that’s silver plated from Amphenol and your could even get one that’s PL-259 on the one end and N on the cable end, thus solving your conversion dilemma.