You do not need to use an adapter. You can purchase hoses that already have the standard BC/drysuit connection QR, each in a length to suit your purpose.
The purpose of the adapter is to allow those divers who have a collection of hoses of various lengths or who wind up with various lengths of standard LP hoses to use them for their BC/drysuit and regulators as needed. And there are many divers who have collected a pile of hoses. Seems like you may be starting on a nice pile of hoses yourself.
Maybe it is a language and culture issue but I do not follow your problem? It initially seemed, I thought, you did not know how long the LP hoses should be for your BC to prevent excess looping? I suggested assembling your kit and measuring the needed length and put your gear on and measure for your drysuit inflator. I do not know any other way to do it.
For Hogartian kit as used in GUE and DIR and many enthusiast divers regardless, the primary is a 40/60/70 inches hose and the secondary is a 20/22/24 inches hose. For conventional kit the primary is typically on a 26 to 28 inches hose and the octopus secondary is on a 36/40 inches hose. The LP BC inflator nad the LP drysuit inflatopr are purchased to fit you and your kit bny measruing them. Unlike the aforementioned regulator hoses there really are no standard lengths for BC/drysuit and are often supplied with those items in a length that would only work well for the Jolly Green Giant..
Of course easiest way to know how long is to measure while having all gear on the back . Actually the other day while gearing up before diving i've seen how too long it was bug couldn't measure it and now i'm no longer in diving place , i dont have any tank to put my gear on and take measure that's why i asked cause i wanted to order new hose before next dives

Will probably test that way also for the secondary around neck
Do you also think , using an elbow on second stage of long hose could help to have less "circle fit" above right shoulder ?