Yes, many of us do switch to one long line, replacing the two originals and the splitter block. Simpler and less possible leak points. The easiest way to determine the line length is to get about a 4 foot length of electrical house wiring, a single strand of the solid copper type. You can easily bend and shape this, and it will hold the configuration. Wrap one end around the banjo bolt on the MC and route the wire down behind the headlight, following the path your brake line will. Mark the bottom end at the caliper banjo bolt, pull the wire out, straighten it, and measure. I put slightly lower than stock Euro bend bars on all mine and a 90cm (about 35.4") line length is perfect for them .....
If you have the higher stock bars, or the Special buckhorn bars, then you will probably need a longer line. They are usually available in 10cm increments.
If you have the higher stock bars, or the Special buckhorn bars, then you will probably need a longer line. They are usually available in 10cm increments.