Rockshox Pike Fitment

Hello fellas once again.

As I keep saying I got my first "actual" mtb this year, a lightly used 2020 trek roscoe 7 which I absolutely loved.

Now I like to tinker with my stuff a lot and I got into thinking of trying some mullet setup since the front can take pretty much any wheel.
Considering leaving the 27.5×2.8 rear and changing the front to a 29×2.8. This ofc requires a new wheel but i u figured it would be easier to swap the front wheel since it's thru-axle ( the rear is that weird 141QR ).
I'll probably make another post discussing wheels as I haven't decided yet whether I should build, buy, buy used etc. Im considering the DT Swiss H1900 35mm and a friend suggested the HX1700 35mm but it's hella expensive.

NOW back to suspension as the post states, the Roscoe comes with a Rockshox Judy Silver, which while better that any fork I had ridden before, is quite unresponsive to small bumps and Im considering an upgrade.
BikeDiscountDE has some pretty sweet sales on RS Pike right now.

• RockShox Pike Ultimate Charger 3 RC2 29" for 583 €
  Looks like a steal to me unless Im missing something. Yes I know they now released the charger 3.1 but that doesn't make the 3 any worse.
  They also have the 27.5 version of it for 416€ (!) which sounds even more of a steal on paper.

Now my questions for you MTB wizards
Would you:
– Buy the 29 Pike for 580€, spend some more to get 29 front wheel and mullet it?
– Buy the 27.5 Pike for 415€ and keep riding your 27.5×2.8 bike enjoying life?
– Buy neither cause the upgrade doesn't make sense for a bike you bought for 300€?

Here are the bd links for anyone who wants to look into the forks himself.
https://www.bike-discount.de/en/rockshox-pike-ultimate-charger-3-rc2-29-debonair-tapered-boost
https://www.bike-discount.de/en/rockshox-pike-ultimate-charger-3-rc2-27.5-debonair-tapered-boost
These are the highest versions of pike right?

Thank you all for your input.