I skimmed.
@TINYHULK
You don't need anything you don't have to ascend/ work SRT, presuming you have a drill/ bit, a stick, a scrap of cord, and a carabiner.
Also, you can easily convert a handled ascender to a knee ascender, and add a scrap of rope for an adjustable foot loop, with a bungee cord from a craft or outdoor gear store. I have handled ascended around from my old rock climbing days. Readily available used or new.
Before installing a base-tie SRT system you can clove-hitch a carabiner or use hitch cord for a carabiner for a 3:1 MA system
Also, commonly pre- limb walk, install a basic 3:1 before starting.
If you have a floating ascender, you can install this at whatever distance you choose away from you. You CAN even wait until you are at the end of your limb walk, if you forget, or realize you need it. Just push the 3:1 ahead of you with a cut branch.
There are more tricks as you advance.
My first SRT was on a Grigri, pre-ZK1, circa 2005-6
F8 revolver came next.
My first rope wrench was a stick, following Kevin Bingham's example.
A stick with an angle rope hole through it, and a tether... that's it, all you need to turn a hitch cord and biner into a srt set-up. I used a hammer handle. A stick works, too.
It would work on a blake's hitch, too, i bet.