Russo-German relations could unravel just the same, the Russians were annoyed about Germany's perceived favoritism to Austria about the Congress of Berlin 1878, and trade issues will creep up.
At some point Russia might just feel the need to ally with someone reliable against the strongest power (Germany).
And France is willing to invest $
The point is Bismarck worked hard to keep the Russians on side and the French isolated. With Bismarck still around, this continues. There were issues with maintaining relations with the Russians, that is obvious, but the existence of the Reinsurance Treaty (a secret deal that explicitly threw the Austrians under the bus) shows how important the Russian aspect of Bismarck’s foreign policy was to him. To claim with Bismarck still around and in power things would go as OTL, makes no sense to me.
Of course the French were willing to invest, they were desperate for an alliance against the Germans. They would do practically anything required to gain an ally, especially one with the “advantages” Russia had.
On the other hand the German-Russian boundary is not in dispute (1815 Congress of Vienna), and same way with the Austrian-Russian border. I don't see any reason Russia can't remain friendly with Germany at some level, i.e a non aggression pact at a minimum, if Germany can keep Austria on a leash. i.e. Something like guaranteeing Austria's per 1878 boundaries and that is it.
A non-aggression Pact is not “some level”, it is a massive diplomatic undertaking and would make a sham of any French alliance the Russians might work out.
OTL, the reactionary autocracy of Tsarist Russia only turned to the democratic Republic of France when the Germans abandoned them, there is no ‘natural’ alignment between the two.