Pie
AFAIK S@H1 will not run S@H2 'WUs' ,you will need BOINC for that.
I understand that it would take an inordinate amount of time for you to switch 150 rigs in one hit ,but why not instead just gradually move them over? ,say 2 clients a week?.That wouldn't take so much of your time then.Of course you'd loose some production ,but its better than nothing.
Besides your fleet would then be growing for about 1.5 yrs hehe