Overforking a P9 (29er build) - good or bad idea?

[Verbl Kint]

Background
On the diagram, letter F (axle to crown) states 571mm, which is the A2C of a 160mm travel Rockshox Lyrik or Pike 29er.  Offset states 42mm.

The Plan
Find a 29" Lyrik 170mm (A2C of 581mm) with a reduced offset of 44mm.  Use it on the P9 to achieve a 65.5 degree head angle.

Good idea or bad idea?

[Verbl Kint]

Did some calculations online on how the geo changes and I'm quite happy with the results.  I wonder if the head tube can take the extra 10mm added.

Hope someone can tell me if this is accurate.

[carbonazza]

What online tool did you use to get the picture ?

[Verbl Kint]

https://bikegeo.muha.cc

The fork list isn't up to date so you need to get the accurate axle to crown measurement of the fork that you want.