Making an item that just casts deep scan actually wouldn't be particularly difficult, even if you wanted it to have limited activations. That said, if anyone does it it won't be me, heh. I've been managing some little things here and there lately, but in general I'm pretty incredibly terrible at coding so more than little things aren't even remotely on the table at the moment. Similarly, reskinned stat/talent point potions that can just generate whenever is pretty much a complete non-issue to make. Just about anyone could probably get that running, since it should be manageable with nothing more than a bit of copy and pasting.
... that aside, while the level up screen thing is an idea and might be nice were it able to happen without there being issues... it kinda' can't. Most of T4's dialogue stuff is kinda' clunky in regards to performance*, and all it takes to see what the effect of a stuffed level up interface is (as a mid to late game tech paladin would have, with the considered change), is rolling an adventurer. Short form if you haven't done it before is the performance can get pretty terrible, extremely long pauses when opening the thing up, investing stat points, stuff like that. It's also a fair pain to actually navigate
when you've got a few dozen trees (locked or otherwise) jammed in there. It's just not really something you'd want to do when leaning on T4/T-Engine's code, at least at the moment. Stuff does fine with what it normally works with, but extreme edge cases (like a tech paladin that's been running for much time after getting deep scan) can cause problems.
Some kind of custom built menu specifically designed to handle something like a tech paladin (i.e. hundreds of talents on a single character) would be pretty awesome, but if you want more than what the 'm' menu already provides, it's going to take exactly that. And that's so far beyond my own capability (and interest, honestly) it's actually mildly amusing.
*If you want a really fun and easy way to see that in practice, play through a few zones in one go, then open up the message log and hold down the up arrow. Take a count of how long it takes for your RAM to bottom out in the face of a T4 with a memory imprint five or six times greater than normal and still going up
Don't think it's a memory leak, exactly (the usage will go back to normal after you close the log), but... yeah.
All that said, if you want a less cheaty tech paladin, you probably want to check out the glutton addon (and maybe the tweak addon for it that's also floating around somewhere around here). It's actually what aether operators took the original talent theft code from, and had a lot more effort (i.e. any, ehehe) put into balancing it.