Well, maybe if you cranked each one to a voltage about .6 or .7 V above what you need, give each one a dummy load of some kind and an isolation diode, and hope that they'll current share - at least the diodes should keep them from eating each other. ;-)
(I don't trust SMPSs since the time I went through about three SSRs - apparently the switchers were eating my SSRs. )-; )
I'll try to remember; I'm not terribly gung-ho about it, and because of budget constraints, I don't plan on actually putting it on ebay yet; I'm so broke I couldn't afford to ship it unless I got paid in advance. )-;
Thanks, Rich