Short answer: carefully...
did the same on a McGregor Venture 222
I built a cradle on a motorcycle hoist ,
Removed keel bolt and dropped keel in cradle with the keel cable still attached.
- this prevented the keel from falling sideways after out - then I released cable.
Installing worked the other way round - Got it in place with help of keel cable - then used hoist to get it into position - so I could re- insert keel bolt
Somehow it worked - but not a fun job.
Make sure cradle is sturdy enough -so that keel doesn’t fall over once it is completely out of the keel trunk
Hope that helps
Dieter
V222 topdog