Maybe do more intricate longer videos with a face behind it on YouTube to monetize some of the crowd over there without having to affect your current viewers.
Ideas -
Character Development Review / Review about the sets / Character history and family line / Favourite Film / Character/ Scene and why / On set footage review / Interesting facts regarding filming / Interesting facts about the actors /
As someone else said this is definitely a bloated market but if you can get people wanting to watch you or your wife and attach to the face behind the content then I’d definitely be way more easier to monetise on YouTube. You can also upsell during these videos or get better sponsors.
In all honesty a £800 bonus is showing more than enough appreciation and as you seem to be a great person and therefore likely a great manager, you’re showing them way more appreciation than you even realise.
Keep up the good work and I hope the best for you🙌🏾