My 2004 330 Ci ZHP has Alcantra seats with no lumbar support.

My questions:

1. Can I add OEM adjustable lumbar support?
2. Is the OEM lumbar support motorized or inflatable?
3. Is it easier to buy a used seat with lumbar to replace existing
seat or modify existing seat?
4. Are the seats in ZHPs "sport seats"? If not, what are they called?
5. Is there any difference in the seat wiring harness between
lumbar/non lumbar seats?

And - last but not least:

6. I hate the metal support bars for the side bolsters they cut into
my thighs and make any trip more than a half hour literally a pain -
any suggestions? (on my E36 M3, I pulled off the upholstery and
cut out the bars out with a hacksaw)