Hi Tyrone,
Changing the focuser is a great way to recondition an old scope,
No need to change th. secondary. The system will work just fine with the new 1.25" focuser. Install the focuser and start observing.
You may like to look at improving the mount though. The mount the old 11T came with is on the shaky side, but nothing some TLC and a clever mind can't over come
There is one long term member here on IIS whose scope is just like yours, and he does amazing things with it. You certainly are not out-gunned here, mate
You might like to look at getting a couple more eyepieces, nothing outlandish, a couple of modest plossls, and you will have the old girl humming. You can also ask for a couple of these too - many folks have them lying around, and will welcome the chance to find a good home for them. Something like a 32mm or 25mm, and a 15mm. Maybe a 5mm too for some high power stuff. And you'l be kitted out for years to come.

to IIS too
Mental.