If you need a structure similar to your translation above, official-Lojban solution #2 must be rather {lo nu broda kei ju'e nu brode}.
La zantufa-0.2 ( http://guskant.github.io/gerna_cipra/zantufa-0.2.html ) allows a full statement in noi-clause or nu-clause. It means the following texts are parsed by la zantufa-0.2 as follows:
1. sentences connected with {i JOI} or {i (tag) bo}:
{nu broda i ju'e brode}
(CU [nu {<CU (¹broda VAU¹)> <i ju'e (¹CU [brode VAU]¹)>} KEI] VAU)
{nu broda i bo brode}
(CU [nu {<CU (¹broda VAU¹)> <i bo (¹CU [brode VAU]¹)>} KEI] VAU)
{nu broda i ba bo brode}
(CU [nu {<CU (¹broda VAU¹)> <i ba bo (¹CU [brode VAU]¹)>} KEI] VAU)
Use KEI or KUhO to cut the statement:
{nu broda kei i ju'e brode}
([CU {nu <CU (¹broda VAU¹)> kei} VAU] [i ju'e {CU <brode VAU>}])
{brodi ra noi broda ku'o i ju'e brode}
([CU {brodi <ra (¹noi [CU {broda VAU}] ku'o¹)> VAU}] [i ju'e {CU <brode VAU>}])
({brodi da} is required here because this {ju'e} connects two sentences, not a fragment and a sentence. It might be allowed in the future version of zantufa, though not yet decided.)
2. sentences between {tu'e ... tu'u}:
{nu tu'e broda i brode tu'u}
(CU [nu {tu'e <(¹CU [broda VAU]¹) (¹i [CU {brode VAU}]¹)> tu'u} KEI] VAU)
3. sentences connected with forethought connective:
{nu ju'e gi broda gi brode gi brodi gi brodo gi brodu}
(CU [nu {CU <(¹ju'e gi¹) broda (¹[gi brode] [gi brodi] [gi brodo] [gi brodu]¹) GIhI> VAU} KEI] VAU)
(Forethought connectives of la zantufa-0.2 can connect more than three "statements (not only sentences)", and {gi'i} is used as the elidible terminator GIhI, not as GIhA. See
http://mw.lojban.org/papri/zantufa_jonma%27o#lo_li.27erla.27i_jonma.27o
for more info.)
As 1 is allowed, your solution #1 is unnecessary, and ma'oi JUhEI in that usage will never implemented to la zantufa.
{ca lo nu mi stuvi'e le sralygu'e zo'u tu'e lo zabna cu fasnu .i lo mabla cu fasnu tu'u}
([{ca <lo (¹nu [mi {CU <stuvi'e (²le sralygu'e KU²) VAU>}] KEI¹) KU>} zo'u] [tu'e {<(¹lo zabna KU¹) (¹cu [fasnu VAU]¹)> <i (¹lo mabla KU¹) (¹cu [fasnu VAU]¹)>} tu'u])
zo'u-clause spans over a statement, that is to say, sentences connected with {i JA/JOI}, {i (tag) bo}, {JOI/tag gi ... gi ...} or {GA ... gi ...}. These connectives can be used instead of {tu'e ... tu'u} in many cases. For example,
([{ca <lo (¹nu [{mi CU} {stuvi'e <le sralygu'e KU> VAU}] KEI¹) KU>} zo'u] [{<lo zabna KU> cu} {fasnu VAU}] [i bo {lo mabla KU} cu] [fasnu VAU])