Would it be enought to set this as the first tiddler to display?
<$reveal state="$:/status/UserName" type="match" text="">
Please set your username first.
<$edit-text tiddler="$:/status/UserName" tag="input" type="text"/>
</$reveal>
<$reveal state="$:/status/UserName" type="nomatch" text="">
If "{{$:/status/UserName}}" is not your name, please change it here
<$edit-text tiddler="$:/status/UserName" tag="input" type="text"/>
</$reveal>
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