It was the UK’s policy for centuries to align against the strongest power or coalition on the continent. They felt that was the best way to keep England safe & independent.
The UK's longstanding policy regarding Continental Europe was to maintain an acceptable balance of power.
Nope. In 1914 there were a grand total of 2 members (Grey and Churchill) of the British Cabinet who wanted war against Germany, while 5 British Cabinet were firmly against any war in any circumstances. Asquith (PM) assessed on 1 August 1914 the majority of Cabinet were against war in any circumstances, but on 2 August 1914 the British Cabinet agreed to go to war in the event of a major violation of Belgium's neutrality.
In the years prior to the war the British foreign office held firm anti-German views, but Eyre Crowe, the architect/inspiration for those anti-German positions is on record as stating the one thing he feared more than Germany was the French-Russian alliance. This suggests Britain was not standing against German hegemony, but instead seeking to appease the Russians.
A 19th century POD would have to occur where Germany is much less threatening and the Brits are more concerned with another power, either the French or the Russians.
According to the firmly anti-German Crowe, the Russian-French alliance posed a greater threat than Germany. The suggestion Anglo-German friction was a result of German weakness is reflected in the contemporary writings of Niall Ferguson and Christopher Clark.
Germany in the early 1900s was poised to upset that balance of power so I see no reason why the UK would just let the Kaiser subjugate Eastern Europe and the Low Countries, royal relations or not.
As outlined above, the British Cabinet were not concerned about geo-political issues and the British foreign office feared Russian potential more than Germany. Do you have any examples of German schemes before the [first world] war to subjugate Eastern Europe and/or the low countries? Mitteleuropa is the only one that comes to mind.
To me, anything else requires a POD before 1900.
According to Dreadnaught by Massie, Wilhelm enjoyed a purple patch of popularity in Britain during his subdued attendance of his Grandmother's funeral in England. Wilhelm was under strict instructions from his diplomatic handlers to rebuff OTL feelers from the British at that time (late 1901?). The German response was not attributable to Anglo-German enmity, but the German diplomatic (mis)calculation an Anglo-German understanding was inevitable and Britain should pay a fair price for German friendship.