FYI, I am a Linker3 Alchemist. However, my stats are 90% SPR and 10% CON. I have 15k HP with plate armor attribute and 8k SP.
The reason I went almost full SPR Is for support. I have 500+ SPR at the moment.
SPR build is rare and my build helps my party as a SP battery. With lifeline, I can guarantee my party 1 tick of 700+ SP per minute. However, if it is timed correctly, some people might get 2 ticks which is 1400+ SP per minute. Considering most Swordsman and Archers only have 1700 SP, this is really good. And unlike Kabbalist, I give SP back to the entire party instead of only one member.
Pretty much with my alchemist in your party, you don’t have to ever use SP pot. My friends who grind and boss hunt with me certainly enjoy this build. So people might consider it.
Oh and I don’t recommend full CON build with lifeline. It might be good for certain instances in ET, but most of the time when you lifeline as full con, it make people panic because of the sudden HP drop. More than 80% of the times they start running around like crazy and break your chain. Thus I don’t suggest full con.