I don't know all the rules but if you decide to sell your ride dowb the road you might have a better resale value having a "derestricted restricted" bike.
Why would want to do that mate?
You are on full license ,you can ride whatever you want if the bike is registered as lams it doesn't mean you have to be on restrictions to ride it.
if you are happy with it as a full powered 600 keep it as it is. In the future if you decide to upgrade you can just put the restrictor back on and sell as lams witch will give you better resale .
Just my 2 cents