Husband of English teacher - what are my options

Hey everybody. I really hope this isn't a question that gets asked annoyingly often. Please refer me to the relevant thread if it is.

My wife and I are keen to live in the East for a while and a friend of ours currently living in Ho Chi Minh recommended it as a destination.

We're in our mid/late 30s, professionals and quite adventurous. South Africans living in Ireland for the past 12 months. EDIT: My wife is also a British citizen.

My wife has a university degree and will therefore be able to find work as an English teacher (and a work permit) without much difficulty.

I, on the other hand, do not have a degree. But I'm an IT consultant but I also have a small group of clients for whom I do digital content. Working remotely will not be an issue ay all.

I was hoping someone could give me some insight into how I could do some work remotely while I was there.

Is this something that is heavily policed? If I did some work for my clients while there on a tourist visa am I at risk for being deported?

If this is possible, does one have to do 'border run' in order to remain in the country?

What about obtaining a student visa? I'm very happy to apply to learn Vietnamese if it'll get me a 12 month visa

Thanks
A