I don't know Belgian laws or its authorities stance on the matter, so i'll abstain from any legal advice on this specific case.
What I can say is that for many EU countries the 183 days rule is just one indicator and not even that important nowadays, I mean it's not enough especially if you will keep doing business mainly in that country, with the same people as before.
e.g. I know EU citizens that were attacked by their former tax agency after years, even though they didn't live there anymore, just because maybe they had an house, or bills on their name, or bank accounts, or their primary market share was still the old country and they flew there regularly (the actual motivation is that some EU countries are some of the worst greedy parasites...)
The relocating step with an active business is tricky, particularly in case of high revenues, as many EU countries nowadays also have "exit taxes" laws in place for companies that move away, even inside EU.
Having the majority of customers in the country you're fleeing from... yes that would still be a big thing they can use against you if they need, as it's pretty obvious you're doing it only for tax savings.
Flying regularly to belgium also it's not good. You have first to make sure to cut you ties cleanly.
There are a bunch of concepts, like Permanent Establishment and ultimately the Double Taxation Treaties (DTTs) between belgium and your new country, that could influence your outcome.
By DIYing you may be fine for a while, but you may also end up with a letter from the belgian tax authorities a year or two later.
Since you don't seem determined to give Belgium the middle finger completely, I suggest to consult an international tax expert that knows your particular company, the belgian law and your personal situation. A decent one that does this for a living every day, not your regular local accountant.
Maybe you could lower your taxes without relocating.
Where you would like to move? Would you like to live in UAE for example or Malta, or would prefer mainland europe?
Revenue?
How many taxes in % of profits are you paying now? (how much of that social/pension contributions)?