Without taking ADM into the equation, Championship White appears to be more widely available in SoCal than last allocation.
https://www.motoringobsession.com/stock/civic-type-r
Power seat typically require different wiring, but may require additional module(s) to work, depending on the design of the vehicle. It's going to be extensive if you want to do it nicely.
It will make more sense to swap an aftermarket sport/bucket seat that you like. However, you still need to...
It appears some dealers in my area are slightly calmed down with Championship White this allocation to 15-25K over MSRP. The last allocation dealers want 20-30K over for Championship White.
Most say ETA is about a month or so.
Castro SRF is pretty set-and-forget for its high wet boiling point. Brake fluid should be changed once every two years regardless of mileage for mostly street use, more frequent depending on how much track use.
Clutch feel and a heavy clutch pedal are two different things. If all you are looking for is a heavier clutch pedal, the only way to do so is to upgrade to at least a stage 1 clutch, which should come with a heavier pressure plate in general.
If you want to switch to a GTI because you feel...
You can run 215/55R16. The only reason I recommend 205/60R16 instead is this size is more commonly used in general back when low profile tires are not as common.
The rule of thumb when up or downsizing is to run a tire size within 5% difference from stock size. Both size will work.
Just because the stock spring rate is the same for both FK8 and FL5 does not mean there is no point of waiting for FL5-specific springs. People who develop springs for FL5 may have a different take on what they believe is good with this chassis. At least the FL5 is slightly heavier than FK8. So...
The wheel/rim size and offset needs to clear the caliper. Too small, you can't run it. Big enough, but offset is too close to the caliper (the more positive it is), you can't run it either.
Tire size affect speedometer reading. The size you are changing to will become slower/faster than what...
It is hard to expect there is no sacrifice or little change in ride quality when you get springs.
There are few FL5-specific aftermarket option at this point. The best thing is to ask for a ride when there are more people with different FL5-specific lowering springs, then pick the one you like...
Unfortunately, most turbocharged 4-cylinder does not have a great soundtrack on its own without pumped-in engine noise/soundaktor. An intake usually improve some sound, but people are still developing FL5-specific intake at this point. The temporary quick fix for now is to replace the stock air...
I've been wondering about the alignment spec. I was pretty close except the Front Caster.
People swear the removal of the Strut Mount Guide Pin can yield more Front Camber. I wonder how significant of a change is there.
This video seems spot-on to your question
Will PPF the front actually save you money by not having to do Paint Correction in the front end? I would ask a different Detailer who does both PPF and Paint Correction to compare.
Option 2 is better. Full-Front PPF is very useful when driving in debris-prone areas. Paint Correction is more important than Ceramic Coating in OP's situation.
It's mostly about risk mitigation. OP may be able to get away without PPF since the areas frequently driven seem very low-risk at getting rock chips. It's either getting a peace-of-mind or save that for something else as long as the area most-travelled is not debris-prone.
I'm in the west...