Khun Nop now lives in CM.
You can reach him on 0846184290.
He is a first class trainer - he got RichardG confident & competent enough to ride nearly 2000kms in Laos in August.
As MBT suggests, you should rent bikes in CM from
either Joe's Bikes, CP, Mr Kom or Mr Mechanic.
Do thoroughly test before setting off.
Just a suggestion you could do a few days off-road training with Nop
in CM & do what RichardG & I will be aiming to do,
which is to ride off-road from Mae Rim to Pai in December.
Peter in Pai is your best source of up-to-date Pai info,
but you could ask Nop as well.