I really love to way how you live your life. However id like to point something out which is in my eyes abit dangerous.
While im also extremly confident that Cardano will be a success, there is nothing guaranteed that you are going to save your buying power with your strategy in the future, as $ADA does not have a proof or records over a longer time period.
Yes you do with ETF’s. I dont really wanna go into details as this is definitly not a financial advice or similiar 
Cheers
Fabian