Inreda (a Dutch company) has a CE-marked device[4] that can be clinically used but one limitation has been glucagon stability (has to be replenished daily). Tandem in the US was working on this as well but I haven't heard anything about them in a while, not sure how far along they are.
The Inreda product is still in the early stages of testing but fully functional. Small crossover trials seem promising (defined by more time in euglycemic state).
There is a competing approach with "intelligent insulin" or a self-regulating glucose sensitive insulin formulation that has different bioavailability depending on circulating glucose levels rather than relying on a monitor, this is farther out from clinical use.
One of the reasons bihormonal pumps haven't entered mainstream use yet is that it's more expensive/complicated and the current techniques of algorithmic predictions of hypoglycemic episodes and insulin delivery suspension are already very good that hypo isn't much of a problem with modern devices like Tandem's offering.
Medtronic has added a meal detection algorithm[5] that's really good too (the best on the market I'm told by my endo colleagues) and they say we're getting close to not needing meal announcement anymore, this practically eliminates carb counting. It's the first such algorithm to be in clinical use so we're not there yet but the expectation is that this approach will get us there.
The question (for glucagon) then becomes how clinically useful more time in euglycemia is as the hypo episode problem is essentially solved, we'll need more data to draw any conclusions and it will take a while for this particular question as many of the outcome measures are long-term (i.e. what are the long-term sequela of mild intermittent hyperglycemia, it's somewhere between nothing and uncontrolled diabetes but how far along on that line is the billion dollar question).
[1] https://pubmed.ncbi.nlm.nih.gov/28007348/
[2] https://jamanetwork.com/journals/jamasurgery/article-abstrac...
[3] https://pubmed.ncbi.nlm.nih.gov/24931572/
[4] https://www.inredadiabetic.nl/en/discover-the-ap/
[5] https://www.medtronicdiabetes.com/products/minimed-780g-insu...