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But it's generally been the case that those churches who let paedobaptists into membership soon have paedobaptist leaders.

Whose fault is that?

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Another issue is having the paedobaptists be baptized as believers by immersion. Someone's conscience is gong to be violated there- either the paedobaptist who is being immersed, or the Baptist church that would allow a paedobaptist into membership without immersing him or her.

One should not violate their conscience and a Baptist Church should not make someone violate their conscience.
I personally believe membership to a local Church and baptism are two separate issues.
Yes I know many disagree with me, but I have yet to been shown in Scripture where I am wrong.

Tom