You could go for the serious range tank, and do everything with longrange. This would take ages, but would be oh so amazing.
Get your attack and strength up to 99x1.5, which is 148. Then get 99 defence and range, and you'll still be range based. If you get 1 more attack/strength level though, you'll be melee based, so just watch out for that.
What I did was get 75 attack and 73 strength so I could use my SGS for slayer to train defence.
¬Albal