I had to read it many times to understand what is the point of you making a loan when you already have money that you invested in bitcoin and you can use it? I have a question:
The day you took your money and decided to buy bitcoin, what was your deal with it? your goal was to buy bitcoin and make hodl and never spend that bitcoin and you die without spending the bitcoin? was that your goal? or was your goal to buy bitcoin and hodl until it increased a lot and then you spent it in the real world?
when we make an investment the objective is to make a profit and then we use that profit, and we continue to invest and then we use the profit, always keeping the principal to generate more profit. it makes no sense to make a loan when you could sell a part of your bitcoins and leave another part until you had a big increase to make more profit
The OP is trying to outsmart the system, he is trying to avoid having to sell his coins by using a loan and in this way avoid paying capital gains taxes, now it is true that some whales can do movements like this but I really do not expect that your average investors can actually do something like this, I think that it is better to keep things simple and to not try to do some fancy moves like this one, if we have to sell our coins for some reason then just sell them, because if we were to do something like this and it does not work then the repercussions will be way worse than to pay taxes on our capital gains.