You could check my revised BPS1 and Feeder 921 (mainly for Bukit
Panjang Ring Road) on Route Suggestions. BPS1 has an optional route
section (if the route is to serve the future Bukit Panjang Hub).
I'm not sure if this optional route section is needed, though...
Yes I saw both.
I think BPS1 can do the full ring route and go to CCK via
Woodlands Road as you have outlined, maybe without calling at BPJ
Ring Road (not needed as there are 920/922/972). So this service
will be used mainly by those going to CCK MRT. I would also add a
stop at Ten Mile Junction. I will renumber this route to 921.
Your 921 is good but not needed with introduction of 972 and
considering BPS1 will be run full day.