Outdoor sump??

Hello.. I am from NW PA and a general handy-person. I currently have a home with a "basement drain" that we've figured out the downstairs washer, downstairs sink, tub, upstairs kitchen sink and dishwasher all go into this "drain". Well, of course, the drain has become clogged somewhere in it's 200' length and I would LIKE to permanently fix this problem. I have the brain child of digging down to the drain (I'm going to say approximately 6-7') putting in a tank, and a sewage pump that then pumps into our septic system as it should be already.

Can this be done? What size pump would I need? Any input?

wher is it draining to now

because of the kicthen sink draining into that line, it needs to be hooked to you septic system

Yes, I realize that this needs done. Unfortunately we were unaware of this until the drain failed. Currently the drain is about 200' of perforated pipe. As we are not the first owners that's about all I know of the drain. What I want to know is if what I described is workable.