In addition to the Lemur, other options include a removable neck model from Upton Bass
, the Chadwick Folding Bass
, the Cossi 99in
as well as luthiers who can convert a bass for you.
For transport, I saw a cool carbon-fibre case that has a separate case for the neck that can attach to the main case, but it's quite expensive. David Gage also has one that is very similar, which Upton also sells
PS: Christopher RN