2 added 102 characters in body
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In my opinion it should be

man sollte einen von beiden ändern

This is the most common use I guess.

ItB6 is wrong, but it would also be correct to use B2 through B6, but B4 through B7 (except for B6). B5 and B7 are overly redundant, as it is clear that von (den) beiden or davon refers to the titles.

It is also pretty clear that is must be einen, because it is der/ein Titel, thus the accusative is einen Titel. Omitting Titel does not change einen to eins. Einen der beiden/einen von den beiden/einen von beiden is short for einen Titel der beiden Titel/einen Titel von den beiden Titeln/einen Titel von beiden Titeln. You're just omitting the nouns here, as the connection is clear.

In my opinion it should be

man sollte einen von beiden ändern

This is the most common use I guess.

It would also be correct to use B2 through B6, but B4 through B6 are overly redundant, as it is clear that von (den) beiden or davon refers to the titles.

It is also pretty clear that is must be einen, because it is der/ein Titel, thus the accusative is einen Titel. Omitting Titel does not change einen to eins. Einen der beiden is short for einen Titel der beiden Titel. You're just omitting the nouns here, as the connection is clear.

In my opinion it should be

man sollte einen von beiden ändern

This is the most common use I guess.

B6 is wrong, but it would also be correct to use B2 through B7 (except for B6). B5 and B7 are overly redundant, as it is clear that von (den) beiden or davon refers to the titles.

It is also pretty clear that is must be einen, because it is der/ein Titel, thus the accusative is einen Titel. Omitting Titel does not change einen to eins. Einen der beiden/einen von den beiden/einen von beiden is short for einen Titel der beiden Titel/einen Titel von den beiden Titeln/einen Titel von beiden Titeln. You're just omitting the nouns here, as the connection is clear.

1
source | link

In my opinion it should be

man sollte einen von beiden ändern

This is the most common use I guess.

It would also be correct to use B2 through B6, but B4 through B6 are overly redundant, as it is clear that von (den) beiden or davon refers to the titles.

It is also pretty clear that is must be einen, because it is der/ein Titel, thus the accusative is einen Titel. Omitting Titel does not change einen to eins. Einen der beiden is short for einen Titel der beiden Titel. You're just omitting the nouns here, as the connection is clear.