Sorry but you are mixing audio compression (FLAC) and Bluetooth audio transmission codes (LDAC Aptx SBC SBCXQ etc.)
SBC is the default on all devices. The rest are all solutions that improve sound quality. The simplest solution would be to turn the SBCXQ on and off. This is a completely free open solution. LDAC is really good, but these headsets cost a lot. Aptx Aptx-HD can be easily added afterwards. These include headphones with good sound quality (with litle compromise). These are in a much more affordable price range.
2 Likes