The Symbiface3 expansion card, as you already know, is a CPC card created by Hans, TMTLogic group, commissioned by Prodatron, creator of the famed SymbOS multi micro-computer operative system.
This means that the SF3 card has been created with a variety of Z80 computers in mind, including our Enterprise.
Actually, being a CPC card, it needs a re-programation of the CPLD that controls its input and output signals, no more being a CPC card except by its connector, that needs to be converted to an Enterprise slot connector by means of a dummy bridge board.
As you can see, it works flawlessly on I/O mode, even on 10Mhz frequency, but it needs some minor fixings on the memory management side to be perfect.
Also, it needs to be integrated on EXOS to be considered "real Enterprise hardware". For example, the included Real Time Clock, mouse port, USB port, SD port, Wifi module, etc, will be integrated with drivers on the system, allowing natural EXOS access to them. It will be a huge task, that surely will also need rewriting of the SF3 core.
Is by those reasons that the release of the SF3 as an Enterprise product still will take months, sorry.