lol? you can EASILY aoid any traps... people who run into traps... means they cant rly play it like an EXP or even NO FAIL... anyhow, 4h would be a problem, though experience with recall and you can do it... (not rly worth it to do solo for all the troubles it causes, but w/e)... vale would be impossible for you... there is no solo build except that one that S toner made that can solo it, and its not a/e... (you couldn't do it because you can't save all the spirits)
MY suggestion is, if you wanna do most of uw solo... well, enter a regular UWSC group (for the 1k cons) and bring 1-2 BU's with you... it'll probably be a fail run, so after everyone leaves, farm plains, pits, pools, wastes ... thats ITm the other areas arent worth farming... or you can always do it solo, dont suggest though, 1 BU= 1 ecto, and maybe you won't get enough to cover, or only abit more while with cons you are faster and its cheaper...
(if u DO wanna farm it solo, i suggest going with GoLE, EVSoH, Sliver, rad field (helps at chamber entrance and many many areas) IAU! (for pools and plains run if u need) and ofc, deaths charge (its your only way to be capable of aggroing everything at chamber AND body block them solo, for that you must DC to the last foe on your ball, at chamber, where ss usually nukes)...
hope this helped, and hf and gl on ur ectos