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Besides it is more cost effective. In my estimation it requires 3 flash drives/SDcards ( two of them as a backup just for the case) ~ $8-10 to keep SSS blob and two pgp HW key (again one for backup, ~$60) and of this for all period, let's take 25 years. Your solution for the same period will cost $25 x 25 + cost of hardware (silver plan) or $100 x 25 + cost of hardware (gold plan) 
You should add the legal costs to this.
Here you are.
2GB Flash Drive - $5.68 . And you can get even cheaper if buy such things in pack. Just do a search.
Security Key C NFC (for setting up gpg key) - $29.00
Looks much cheaper than your plan, isn't it.