For grip you use sharp knife and just cut & peel it off.
To put on EVA tube you will also need to remove guides, unless your blank is not tapered at the back and you can slide it on from the rear, or use flat sheet foam rubber and contact glue, works 100%
To remove winch may be tricky depending with what type of glue it has been put in place, if metal or graphite, taper of rod, and how tightly it fits. I always use hotmelt for that purpose and recently had a factory rod that also had some glue that came off with heat.
Mostly u need to cut it with a sharp knife or hacksaw blade, and buy a new one. Again, you need to consider if you need to remove guides as well to be able to replace winch.
If winch has some sort of hotmelt, it may be possible to move it without damage.
Why do you want to remove the winch?