So, Sir, you propose to worsen already bad effective wpf in archery and melee prof with heavy armor. Cool advice. Got another?
Perfectly fine = what? 30-3 or 3-3?
With only 15 arrows, there no sense to take a bow and spend 160 wpf and 5 skillpoints on this. It's just pointless
No sir, I propose to wear a "Sarranid guard armor" which can currently be worn while being below the 15 "free" ranged weight so it would not matter at all for the ranged part, and about the melee, I can melee decently with 0 wpf, so eh, don't see your problem here.
And yes I got another piece of advice, in fact, I got two pieces of advice, first, 15 arrows last long if you don't spam 'em and if you pick missed arrows back when the opportunity comes instead of just camp a tower all round, you could still use a oneslot quarterstaff instead of a longsword which is more than a decent weapon, or a 2h mace or a 1h Warhammer and then have 30 arrows. Secondly, realize that I said that you CAN wear decent armor, didn't say it was a requirement, even mentioned I melee in cloth on most of my alts.