I came across this guy whilst browsing bee stuff. As you do. Not sure if it works but the guy has obviously done a lot of work and research on it and it seems to work. Someone who is a lot more proactive than me, and may have a little more time, would probably start this tomorrow. Let me know how you go and tag me please!!! Then I’ll make it a priority. 
Small Hive Beetle Ultimate Prevention, a test using live hive beetles to control, stop and trap - YouTube
And just to let you know there’s an also an updated video to this one. Neverwet coated Barriers controls, traps and prevents small hive beetles, New Beetle Barrier 2.0 - YouTube