I have worked past 2.5 years on a L-1b, and assume I have 2.5 years left for a total 5 years of duration allowed for L-1b. I am from a country other than India or China (for priority date purpose), and plan to go for a GC in a year given employer agrees. My current responsibilities are inclined more towards a L-1b than L-1a but that might change in 6 months to a year as I expect to get into a managerial role. Looks like L-1a has advantage over L-1b given a longer duration of 7 years, and a shorter/quicker process of GC thru EB1. My questions:
a) Should I change my L-1b to L-1a for these advantages? Any disadvantage or lack of advantage? What requirements are there to apply and get approved for the change? Costs to my employer?
b) Can I apply for EB1 after the switch? If yes, is it easier to get GC thru EB1 rather than EB2?
c) Can I self-petition for EB1 as multinational manager once on L-1a?
Thanks a ton!