So, you want a layout the way it
should be.
As a previous Amiga user, I agree.
I'm afraid that the only option right now would be to use a vintage keyboard with a special adapter.
The layout with Ctrl - Caps Lock - A was prominent on DEC (Digital Equipement Corp.) terminal keyboards that were very influential. There
may be some keyboard that has the same layout as the DEC LK-201 but which talks PS/2, I have a hunch that one could exist... Beware that there have been quite a few keyboard protocols throughout the years that have also used a Mini-DIN connector but which does not actually do PS/2 signalling: for instance Apple's ADB and many Commodore Amiga keyboards.
The HIL protocol used by the HP keyboards is
electrically incompatible with simple microcontrollers, needing conversion circuitry so if one adapter to PS/2 or USB exists, I would think that it is rare.
The only "modern" keyboard I have seen with two keys to the left of A has been a few laptop keyboards, such as the 2012 Thinkpad X1 Carbon... and that keyboard was very much disliked, as you can read in this review:
Stop trying to innovate keyboards. You’re just making them worse.