If Germany has an extra 24 divisions, the French are likely to notice.
Well a broken clock is right twice a day so there is that.
The idiocy of Plan XVII dropped for something far more defensive and wait for the Russians.
Which will work right up until the Russians start screaming at the French to carry their weight.
Only strengthening the reserves would offer the French much hope
There is no reserve left to strengthen the reserve - France had been overdrafting it's population to make it as strong as it was. France could not make it stronger, short of drafting it's female population.
The British will even notice it.
They will notice the lack of a HSF.
The realization that France would need real assistance against Germany would likely mean an Army expansion.
Or, they head of the issue at start. OTL they drifted towards France and Russia because of hostility to Germany, and a fear of being constrained by the Franco-Russian alliance. ITTL, Germany won't have that Navy, and focused as it is on Russia and France, serves as a much better counterbalance than OTL.
So odds are that the Entente never happens, and the many preceding crisises has different resolutions. One reason the conference system broke down, is because everything crystalised into fixed positions - If we imagine the July crisis with the UK as a free agent, it's much more likely that AH is willing to let it go to a conference, and that resolves it. Even if this then leads to war, A british guarantee of neutrality might very well be seen as genuine for Germany. Though i have to also say that with a UK that isn't a part of the Franco-Russian block the Russians might very well not be willing to risk war. OTL, they perceived themselves to be the stronger side and thus felt they could risk war, but with the UK not a part of said block they might make a different math and come to the conclusion that waiting a few years is the better option.