question

Hi BM. The new Orion Smart won't be a 2-way device, else they'd surely call it a Cyrix.. :)

There may be something in the Cyrix range that would suit you, depending on what your Li batts demand. https://www.victronenergy.com/battery-isolators-and-combiners/cyrix-battery-combiners

At very least, a way to transfer back from your solar > starter batts.

@brassmonkey001, your current options for (reliably, simply, and safely) charging your LFP bank from your alternator are both Sterling products... you can get the Sterling AB12210, which will connect directly to your alternator and provide multiple charge profiles out, including an LFP profile that would be appropriate for you; alternatively you can go the battery-to-battery way, connecting your start battery to your LFP bank and charging that way with a Sterling BB1260, or if you need a waterproof version the BBW1260.

That being said, if you want to stay all-Victron (even if just to keep that awesome Bluetooth functionality), then by all means wait another few months for the Orion Smart, which Europe should see sometime in December and we should see in the States sometime around late January. We haven't seen tech specs yet... I know it'll be in the ubiquitous MPPT casing, but I don't know what amperages are going to be initially available.

I second @JohnC in recommending you check out the Cyrix-Li line to see if one of those 3 models would meet your needs in terms of passing charge to your start batt from your solar-topped LFPs.