Health mod on Rinblade is maybe 1-500g if you're lucky. Rin's not too valuable by itself [basically whatever it costs you at the weapon npc, plus maybe a couple gold for profit].
[IIRC] Charr Shields aren't very useful once you get the Vanguard quest as the base shield armor's negated. The shield still works if you don't have the VG armor buff. but the VG buff's greater than most [if not all] forms of armor... at least from my understanding. I could be wrong, I guess.
You'd be lucky to get up to one black dye for the shield, but it'd be a challenge trying to sell it unless you come across the right buyer.
Max shield base armor in pre's 12, and the max vs charr bonus armor's 9. It'd be even better if it were dual-modded with a relevant stat [i.e.: -n.dmg(m%, w.enchanted, w.hexed, etc.). Tactics shields are the majority-demand, but there're likely some who want strength shields for highly-classified reasons.