Ok - just realized that I still had access to this other account from another pc
Thanks for pointing this out, unfortunately I am aware that it's a nightmare - I attended a conference on how to start a fund and at the end my takeway was "Ok, it's impossible to start a fund" (in Europe)
The problem in general seems to be having visibility to investors without having to spend a fortune to set up a fund first.
There are some fund management services/umbrella company that takes care of everything for you - but in this case you would need to find investors first, as costs run around EUR 30k per year as far as I'm aware.
There are few exemptions as you mention, but for one reason or the other they don't really seem viable:
It's basically impossible to fit in the exemption for smaller funds if you are operating on derivatives, as what they look at is the underlying amount being moved.
There is another exemption for family offices/investing employee's money - but unless you have just 1-2 HNWI as investors it's hard to make it work this way.
Another way to go should be to have your own "technology"/"advisor" company that executes on other people's accounts, without having any actual access to their money - the problem in this case is that it's hard to build an auditable track record out of it.
Something I recently discovered is the possibility of setting an incubator fund with just your capital as an investment, but which should give you the desired visibility to investors:
http://www.investmentlawgroup.com/launching-an-incubator-hedge-fund
Still need to have a more in-depth look at it though (the linked article is for the US btw)