I've just added keyword- and status-based filtering to the
SRFI search UI at <https://srfi.schemers.org/>.  It runs in
the browser, and is instantaneous.  However, it's still
bookmarkable, e.g. this URL shows all the draft SRFIs about
data structures in order of increasing SRFI number:

  <https://srfi.schemers.org/?sort=number-asc&keywords=data-structure&statuses=draft>

Feedback is welcome.  I'm particularly interested in
improvements to the set of keywords I've assigned to the
SRFIs.  They're a really rough cut right now.  Here's the
full list of keywords:

  Algorithm
  Arithmetic
  Assignment
  Binding
  Comparison
  Concurrency
  Continuations
  Control
  Data
  Error
  Exceptions
  Features
  I/O
  Internationalization
  Introspection
  Lazy
  Miscellaneous
  Modules
  Multiple
  Operating
  Optimization
  Parameters
  Pattern
  Reader
  Syntax
  Testing
  Type

You can see the keywords assigned to each SRFI on each
SRFI's "card" on the home page.  If you'd like access to the
raw data, it's here:

<https://github.com/scheme-requests-for-implementation/srfi-common/blob/master/admin/srfi-data.scm>

I hope this makes finding the SRFI you're looking for quick
and easy.