I've never tried this before but its possible I've heard to time-lock some BTC coins when you are sending them.

With Electrum when you make a transaction there is an option which shows you the BTC block timelock  and I've never tried changing it but its possible you can change it and if you want your coins available in 5 years just do the calculations.

10 blocks per minute so 144 a day so ~52,560 per year so in 5 years its 262,800. So you add that number to the current block count which is 584237 and you get 847,037.

Before you do this, maybe do a sample or 2 transaction like a week or an hour ahead of time and see if it works for you first. Because it would suck waiting 5 years and only to discover that you made a mistake and can't recover those coins.