Give this a try: 
\define showrev(id,label)
$label$ {{!!$id$}} {{!!$id$date}} <<getrev "$id$" "$label$">>
\end

\define getrev(id,label)
<$edit-text tiddler="$:/temp/$id$" tag="input" default="" />
<$button actions=<<setrev "$id$">>> Update $label$ </$button>
\end

\define setrev(id)
<$action-setfield $tiddler=<<currentTiddler>> $id$={{$:/temp/$id$}} 
$id$date=<<now "YYYY0MM0DD0hh0mm0ss">> />
\end

<<showrev id:"step1" label:"Step 1">>
<<showrev id:"step2" label:"Step 2">>
<<showrev id:"step3" label:"Step 3">>
<<showrev id:"step4" label:"Step 4">>

Let me know how it goes...

enjoy,
-e

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