If you prefer, you could write an IPv6 address in dotted-decimal notation just like an IPv4 address, or an IPv4 in hexadecimal notation like an IPv6 address. It's just 128 (IPv6) or 32 (IPv4) bits of data after all, the representation is completely independent of the protocol.
For example, you can also reach HN through it's IPv4 address by writing http://3520653007/ or http://0xD1D8E6CF/.
Your proposal, as usual for these kinds of proposals, fails to consider how would an "old world" endpoint talk to a "new world" endpoint. An "old world" endpoint wouldn't know about these "additional 5 bytes", and would both send packets without them to "new world" endpoints (confusing them) and treat them as data bytes when receiving from "new world" endpoints. The only solution would be to upgrade all the computers on the "old world" first, but once you have to do that you could move them all to the "new world" instead.
If what you want is just the addressing (for instance, you already have 192.0.2.1, and want to use it for IPv6 without needing to obtain an IPv6 address first), there's already 6to4, which has most of the properties you want: it exists on top of IPv4, your router announces the IPv4 prefix, and IPv6 packets sent to it are transparently routed to a relay router which encapsulates them inside IPv4 packets destined to that IPv4 address (in the other direction, your encapsulated packets are sent to a relay router which extracts the IPv6 packet and forwards it). I've used this in the past to give full IPv6 connectivity to a site which had only a single IPv4 address, and it worked well.
Think of it like the mail service. For the majority of the journey your letter is only routed based on the first 3 digits of the zip code. When it reaches the last mile sorting facilities is when the full address becomes relevant.
You haven't managed to suggest anything that v6 doesn't already do, or anything that would solve any of the problems v6 has when doing it. I'm not sure you even noticed the problems, yet you think you can throw stones at the v6 people, who not only noticed the problems but had to solve them too?
We are now 26 years in and v6 has only gotten serious adoption because mobile carriers came along too late in the game to get enough number resources.
Now your border router can announce your assigned transitional prefix, i.e. 53.32.122.91/32, and is responsible for routing packets to a NAT gateway that knows both v4 and v6 and rewrites packets seamlessly each way.
What we are left with is a scheme that allows v6 to exist on top of v4 and continue working across the existing internet, and the only people who need to worry about it or upgrade anything are the ones who need more address space.
But instead they followed the model of baking in every stakeholders random pet project into v6 to get consensus in the hopes of forcing adoption. They put letters in the middle of numbers, and expected us to not hate it like algebra.