How can I send out pending agreements for signature en masse on a scheduled basis?

Question

I'm using EchoSign's Salesforce integration, and I'm trying to create a scheduled batch that will send out a large number of agreements for signature.  EchoSign has some exposed global methods that I'd hoped will help facilitate this, namely AgreementTemplateService.load, which generates an agreement based on an agreement template ID, and EchoSignAPIService.sendDocument, which sends out an agreement that it is provided.  Also, using the background action field on Agreement, it is possible to update an Agreement to 'Send', triggering its send-out.
I can do all this through code anonymously, or via a custom page at the click of a button, but to do it without user interaction is proving difficult.  Regardless of whether I try to do it via trigger or scheduled batch, the above-mentioned methods fail out in different ways that essentially amount to the same problem (trying to call a future method from a batch, or a callout from a trigger); I've reproduced the error messages here (these are stamped onto the agreement record and displayed when the record is viewed):
System.CalloutException: Callout from triggers are currently not supported
System.AsyncException: Future method cannot be called from a future
You have uncommitted work pending. Please commit or rollback before calling out
It seems the above methods are intended for use in a custom page, rather than in some scheduled, non-interactive use-case.  Is there any workaround for this, or support for sending out agreements at a scheduled time, rather than at the click of a button?  Thanks!

Answer 1

I'm not an Adoby guy, hence you may ignore my reply, but Adobe Dynamic Link is obviously not just one way ticket and in most cases works just fine.
You have already been explained by J-MS and tclark513 how to properly use it and which pitfalls may occur.
So as to apply an effect onto a whole sequence or a group of clips you need to either nest them in PrPro or pre-compose them in AE. Then just apply an effect (or several ones) onto that composition.
So, if you nest clips in PrPro, select your nested sequence in the timeline, right-click and choose 'Replace with After Effects Composition'. Done! Your dynamically linked AE composition is in the right place in your timeline and in your Project panel as well. If you can not treat it as an ordinary footage, there are obviously some mistakes in your workflow. 
If you didn't nest your sequence or a group of clips in PrPro before replacing them with AE composition, you may easily do it within AE. Just select all the layers in AE composition and choose Layer -> Pre-compose... (Ctrl/Cmd+Shift+C) Done! Switch back to your Master comp and apply your desired effect(s) 
You may loose some effects or/and transitions while travelling from PrPro to AE via Adobe Dynamic Link, whereas you don't while travelling back
(If you start building your AE composition from scratch right in AE and then need to import it into PrPro, DO NOT export one as PrPro project out of AE, but rather choose Adobe Dynamic Link -> Import After Effects Composition... within PrPro)
P.S. And yes, submit a feature-request so that Adobe will convert 'Transparent Video' into fully functional 'Adjustment Layer'.