What is the issue with the parking brake? Nothing can be as bad as an EPB. I sit in the Amazon just to pull the parking brake lever on, then release it again.
The 100 series' parking brake is OK for parking, if maintained annually. The most important issue is to keep the bellcrank lubricated, otherwise the friction in the linkage will go up until unusable. So, an annual clean, lube, adjust, will keep it going. The adjustment procedure is slightly different from other cars, so following the steps in the FSM religiously is one secret to a good hand brake.
Another issue is that the brake booster
will fail, eventually, leaving you with about 2% braking force, on the front wheels only. Zero on the rears. That's when you need a good, working hand brake. Keeping a keen eye, and ear, on the brake booster might save you from that scary experience. When the alarm goes off for too low brake booster accumulator pressure, you still have pressure for one or two full stops, but that's it. Also a broken brake line will give you a similar experience, with next to no brakes, depending on where it is leaking.
I have managed to lock the rear wheels with the hand brake, when newly serviced, with an empty car on a paved, but dusty, road.
I have also tried the longer dog bone, but it just changes the geometry a bit, so that the adjustment is different, but it's not better in any way. you will also have to bed in the shoes for a completely different "angle of attack", wasting a lot of lining. I bought a kit from OZ, with "the best brake shoes ever", stronger springs and a longer dog bone. The brake shoes where rubbish - no grip. The OEM shoes seems to be the best available, according to what I've heard and read. The longer dog bones also made the top end of the shoes want to jump out from the pivot bolt, necessitating a larger washer/plate holding them in.