Yes this trek is always open in all season
i went there last year it took 3 hours to reach and when we came from there it took 2.5 hour, it was my first trek thats why it took so much time other wise my guide said if u were a good trekker it only took 1.5 hour to reach.
Yes Jeep track is not that good but jeep can go easily through this village i saw jeeps before the trek start.
Don't know about this I think you will get some guide and porters just roam around over there ask local people they will help u as what I did.