I’m considering bike packing for a couple weeks and wan to convert this bike.

I’m wanting to know what the best back rack would be for this model, and I’m also wondering what size I’d need to convert it to a single front speed and to change the stem and headset to a regular mtb stem and some horned bars. Now I have mostly all the gear and everything is ultralight and packs down small from backpacking so I feel as if I’d have all the space I’d need between the basket, back rack and potential a frame bag one a seat pack if I can fit it. Now before I get crap for my seat like I did for my last post, these photos are almost a year old from when I got the bike, I had only ever rode Dirtjumpers and bmx so I just didn’t understand the use of a raised seat. But after my last post trust me I do now, lol.