You're making that suggestion towards a populous that simply degrades the class into two groups: "how i shot link" and "hur hur kaahi". 
In all seriousness, if you want to take your SL seriously, go to Job 50. If not, don't even bother with 46. Seeing as how its a Link slave, most of the time, go to 40 and be happy about it.
How often will you need your Rests at level 7?
I mean, the only practical uses there are is in PvM. WoE Wise, a Linker should never standing still, let alone sitting, right?
And there should never be two linkers in the same place at once (On purpose) So that kinda defeats the purpose of The Regain.
In PvM, You really don't "need" running. And in Woe, You really don't "need" the rest skills; Aside from the fact that they unlock WW.
Basically, Theres really no harm in changing at 46-47. Your preformance won't be effected in Woe. All it requires you do is possibly restat every now and then.
Personally; Its what I did, and I've never had any problems, myself.