Hello Kristin S
As I hope you understand, asking about which eateries will be open to you in 2023 in the midst of the greatest tourism crisis Siem Reap in particular, and other parts of Cambodia in general have ever faced, is akin to consulting a crystal ball at the present moment.
So many of the options we have known in past years are unlikely to survive and be available to us in 2023. Only time will tell which ones are left standing and still operating. The economic pressures on landlords/leasors and leasees due to the Covid - 19 induced collapse in tourism for so long now is taking a heavy toll.
One has only to read the Cambodia business and real estate related media as well as the expat media to see the number of former tourism related properties, businesses and leases up for sale or transfer etc to understand this.
But regardless, where there is a demand there will be a supplier so your husband will not starve.
Best regards. Ian