[djanym]

https://wordpress.org/plugins/optional-email/
is it works for you?

[djanym]

I’ve made such way:
Added a function in functions.php and call it in beginning of the page.

function set_displayed_user( $user_id ) {
global $bp;

$bp->displayed_user->id = $user_id;
$bp->displayed_user->domain = bp_core_get_user_domain( $bp->displayed_user->id );
$bp->displayed_user->userdata = bp_core_get_core_userdata( $bp->displayed_user->id );
$bp->displayed_user->fullname = bp_core_get_user_displayname( $bp->displayed_user->id );
}