What a load of tripe, back bleed it. I used to work (still do in a way) with heavy plant and the engineers always backbleed and rarely have problems.
A squeesable bottle is needed, i use an old brake fluid bottle with an old nipple fitted in the bottom.
Fit hose to said nipple then other end to the caliper,
Fill bottle with fluid allowing it to drain into the caliper, fit top,
With a decent bit of hose you can tie it up well above the caliper,
Keep checking the master cyl as you squeese the bottle, removing excess as required, if you run out of squeese just remove the top and reduce finger pressure. No air will get in to the brake system while you do this then with the top on your ready for another squeese,
Once there are no bubbles in the resivoir your done, you should get a single system done in one GENTLE squeese,
If its a multiple system bleed from one caliper to the other then from each to the master cyl.
That method needs only one person although no harm in an extra pair of hands, needs minimal amounts of fluid and WORKS. No messing with opening and closing squeese no squeese etc,open and close the nipple just once.
I even used it on those hard to bleed nissin 6 pots with excelent results.