BTC hobby fund

I have a € (Euro) emergency fund, and now I thought it would be a psychological good idea to build a (from my normal long time btc savings seperated) Bitcoin hobby/fun fund. A fund that just exist for the purpose of making me feel good, that I know that I always have a fund that I could use for anything I like if I wanted (but probably wont), like buying a gaming console or other stuff, while still having the potential to grow in value in the time I dont use it.

But here is the important part, a normal bitcoin wallet is not the best choice for such a "Use it when I feel to"-fund, because having to calculate taxes and send it to the financial institution of my country every time is a pain in the ass, not worth it for random hobby purchases.

The good thing is, in my country, brokers/exchanges that operate from within my country are required to automate the tax process, they automatically calculate the taxes for you and even send the money you owe the goverment to the goverment. So every time you close a position with profit, the taxes automatically get drawn away from it and only the money you can keep stays in your account.

So I thought I d just make a small 1000€ Btc fun/hobby fund on such an broker/exchange. What do you think about this idea? Its mainly for psychological reasons.