I would make an account with like 40 attack, 50 str, and 1 defense to start out, then train slayer and level up stat's acording to what you need for the tasks. Leveling strength and defense when you kill slayer monsters.. Shoot for 99slayerand defense.. Just my opinion
Considering you only have 14 days, just go with a defense noob. When your main gets unbanned, xfer some cash to set him up with full dragon as a super low level!