Username alias while retaining memberaction_dropdown functionality

[WorldCraft]

Hello, I have a roleplay forum and have made a custom profile field where users can specify an alias. I made the following modifications in my postbit_legacy template:

			<div class="username_container">
			<vb:if condition="$post['userid']">
<vb:if condition="in_array($thread[forumid], array(84,85)) AND $post['field12']">
<a href="member.php?{vb:raw post.userid}"><b>{vb:raw post.field12}</b></a>
{vb:raw post.onlinestatus}
<vb:else />
{vb:raw memberaction_dropdown}
{vb:raw post.onlinestatus}
</vb:if>
			<vb:else />
<span class="username guest">{vb:raw post.musername}</span>
				</vb:if>
			</div>

You can see in the following that when a user has posted in forumid's 84 or 85, the name specified in field12 will display instead of their username. This works fine, but I would like to keep the memberaction_dropdown functionality while in these forums. Currently as you can see it will just link directly to their profile.