I am running Lasso 8.6.3 on OS X 10.12.2 (like I did on OS X 10.11). The discussions you point to are relevant. I installed using the plain 8.6.3 installer and then because of the System Integrity Protection (SIP) I had to make this folder:
That is where I put the Lasso8ConnectorforApache2.4.so which of course has to be the apache2.4 version.
Then I just referenced the connector in /private/etc/apache2/users/lasso8.conf