RH drive car, looking for remote oil filter options

Yes, that bolt is in a terrible position on RHD cars.
Best option if the engine is coming apart is to remove this adaptor,

I like it! I like it a LOT!

Except....

What kind of secret handshake/special tool does it take to remove this blasted thing?
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I was looking into this during my lunch break today, and while I never saw this exact adapter anywhere, I did find mention of an Allen head bolt one could loosen-up for removal on other Mopar V8's.

Except there's no Allen head bolt, or anything else I can find, that holds this onto the block. Shots down the center of both bores shows nothing:

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Is this adapter a spin-on of some sort? If so, how does one take it off? Obviously it was removed when the engine was rebuilt (cylinders still show some nice cross hatch in the bottom of the bores), so I have to believe that SOMEONE has a tool that can do this without mucking everything up!

(Edit: Hmmmm. Looks like NPT thread in there. If it's a spin-on piece, can I simply install two short pipe nipples and use a pry bar?)

I fully realize I can leave this on there and learn to live with it (aka: fight with it when the engine goes back-in), but I really hate the interference caused by the "clock position" of that one hole, and if I'm to replace this with something else (a Trans-Dapt kit, for example), I first have to remove this da** thing!

(And I'm now thinking to myself, "All I wanted to do was help a buddy out and get his car running. That's it, Lord! That's all I wanted to do, honest!"")