Yes, no, maybe. The Belgian revolution happened because of mismanagement by king Willem I and especialy by his son future king Willem II. If my proposed POD would cause a different kind of goverment, with more people who were involved in the Batavian Republic in charge, you could see a different government style and reaction to any Belgian dissatisfaction and butterfly away the Belgian revolution, or make sure the revolt is nipped in the bud. Does this automatically follow from the POD's? No, but it could be a result from the POD's.
Willem I is a mixed bag. He was a visionary and a workaholic, but also couldn't delegate and got stuck in micromanagement. Him ruling as a wannabe absolutist monarch didn't help, OTOH IMHO it would be unrealistic to expect a constitution like the Netherlands got in 1848. Willem II is a different matter, his actions while he, as the Prince of Orange, resided in the South could almost be seen as bordering treachery.
One grievance was the Estates General (Parliament), the more populous South felt and was under-represented, OTOH the North didn't want to be dominated by the South either and feared that they would. An obvious way to remedy this is to make the Second Chamber (Commons) proportional (though given the era based on census suffrage), while the First Chamber (Senate) gives the same number of representatives to each province. And while being under-represented, the Debt was shared equally and especially the North had been ruined by the Revolutionary and Napoleonic wars, British produce flooding our markets post 1815, didn't help either. The South didn't have such debts, and through industrialization became even more prosperous in the mostly French/Walloon speaking parts.
Religious policy and language policies is, what ultimately drove dissatisfied Southern politicians together. It doesn't mean they all valued these matters in the same way, but it did create a huge opposition, based on the enemy of my enemy. Especially Willem I introducing Dutch in the Walloon provinces as an official language of administration was a bit too much . Even the Flemish provinces, might have wanted a period of being bilingual, since many of the Flemish elites were just that.
Another mistake of Willem I is that he, like what he did with Protestant churches, wanted to increase State influence (with its' at least perceived Protestant dominance) on the Catholic Church in the entire kingdom, through a Concordat. While the Catholics, who follow Rome and the Pope in Religious matters, saw it as an attack on the Freedom of Religion.
