I have flown PT-6 aircraft with and without autofeather installations. I have
also flown Allison 501 engines without autofeather. So in this case, you are on your own with no feathering help.
Perhaps it is PIC decision but at such a critical moment if you have low speed and high drag(you stated stalls in the first post), I would suggest that feathering immediately is the best option unless you can be sure that your performance is so good(very light weight and low density altitude) that you can climb reasonably well with all the extra drag.