[Help-bash] History Expansion

[J.B.]

Hi folks. Trying to sort out how to use word substitution on history 
events in this one specific case-

Say I have this long command:
tailf -n 1 /some/really/long/path/to/a/logfile | grep -iw 
"some\|neat\|things\|to\|grep"
And now i want to run that command on a different log file, but this 
doesn't seem to work:
!?/som?:%:s,,/path/to/new/logfile
It instead only matches '/som' and performs the substitution on that 
pattern alone.

This does work:
!tai:-2 /path/to/new/logfile !tai:4*
But that sucks.

This also works:
!?/som?:s,/some/really/long/path/to/a/logfile,/path/to/new/logfile
But sucks even more.

I want a way to match an argument and perform a substitution on it 
without having to type it out entirely. Using the star glob as the 
string to match doesn't work: :%:s,*,/path/to/new/logfile. How can I 
accomplish that?