How can a pilot become established on the KBIV, ILS or LOC Rwy 26 Approach?
To answer question #1, you are not allowed to use this approach when arriving to the PMM VOR from radial degree numbers 004 ascending to 091. This means that you can not fly in to PMM from the Northish, Northeast, or East. This is probably to avoid conflict with the major congested area of Grand Rapids and its associated airport’s Class B airspace. Also, V170 is no longer an active victor airway. And, PMM R-29 is unusable for VOR only navigation. However, this does not preclude using this approach for local flights and radar vectoring where an arrival would not be necessary.
To answer question #2, the course reversal at JAVPO is not mandatory. It is a Holding pattern in lieu of procedure turns. JAVPO is the Intermediate Fix for the approach. You can use JAVPO or its associated intermediate leg as a gate for a straight-in approach on the IAP. Just state your intentions and get clearance to maintain spacing and separation.
Wbeard52 has given a great acronym to remember when a procedure turn is not required. Another one to remember is the one derived from the FAA‘s list of situations not requiring a procedure turn included in the Instrument Flying Handbook. It is the acronym taught to prepare for the FAA written knowledge test and the practical checkride.
S.H.A.R.P.T.T.

Straight in approaches
Hold in lieu of procedure turns
Arc approaches
Radar vectoring
No Pt noted on the approach
Teardrop course reversal approaches
Timed (start) approaches

One point to note is that a procedure turn should be planned anytime the angle inbound to join the approach will result in a turn of greater than 90°. This means that flying from PMM on the 033 radial direct to JAVPO without vectoring would result in a course reversal. However, you could hold on the published hold at PMM to get set up for the approach. This would necessitate holding at a traditionally very busy (aircraft dense) fix, though. Probably something both you and ATC want to avoid for a GA aircraft if possible.