[Closed] Scalpel Si Full Sprint Removal?

I've got a Scalpel Si and want shut of the full sprint,

rear shock is a monarch xx, lefty 2.0 up front, i know the part to convert the fork to PBR is KH188, which ive ordered,

however, on the monarch, I'm assuming i cannot just unscrew the lock out, do i need a different shock?

i know the length is 190x45 which are a bit thin on the ground, the Scalpel SE uses a more familiar 190x51mm, plenty of these about, increases the travel a touch, but what happens with the Tune?

alternatively, has anyone tried a Cane Creek DB inline? do they fit?

https://www.ebay.co.uk/itm/Cane-Creek-Double-Barrel-Air-Inline-Rear-Shock-190x45mm/402005432654?epid=12019010158&hash=item5d9964194e:g:PpwAAOSwJYVd3Iny