Try:
//scon -a echo -a timer® $!+ $!server
The key factor here is that you need to escape the $+ from evaluating, or it will concatenate the timer® part with the first evaluation of $!server, which evaluates to $server, thus resulting into timer®$server.
Note that, although some experienced scripters pass code to scon -a and the likes, generally it's better to just pass an alias name, and then let the alias take care of it. You will be scratching your head less, and you won't have to worry about exploits.
alias test scon -a _test
alias _test echo -a timer® $+ $server
