Actually its not actually a bad idea since how could you fund your business if you didn't take a loan to make it happen? Its just you making all of things work according to what you like to happen. If you scared enough to do this then could you get a result for having that feeling? For sure not. In Bitcoin I think its the same if you could pay back the lender why not? You are not trading it, but rather you are investing it for long term so with that set up I think everything is fine.
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It may not be a very bad idea to borrow money to invest in Bitcoin once you are capable of paying back the loan. However, it is not encouraging to borrow money just to invest in Bitcoin, because you will still need to pay back the money, including the interest. Instead of borrowing money, why not buy Bitcoin gradually? Why not continue buying, even with the little amount you may be getting monthly or weekly? This approach  will serve DCA method where you acquire Bitcoin at different price levels.

Borrowing to invest in Bitcoin will never give someone peace of mind. Even if the person decides to hold for a long period of time, it will still cause worry at times, as Bitcoin's price cannot continuously move in one direction. It will always fluctuate, going up and down.

Investing in Bitcoin is not like starting a business where you need to gather everything customers require, which often demands large capital. Instead, you can start small and build your  Bitcoin investment over time.