In The Unicode Standard, Duployan Shorthand implementation is discussed in  Chapter 21 Notational Systems: Shorthands, Braille, Musical Symbols.

Duployan Shorthand was encoded in The Unicode Standard version 7.0. The script is now encoded in the following blocks:

BlocksCharacter RangeAdded in Unicode VersionUnicode chart
Duployan 1BC00..1BC9F 7.0  U1BC00.pdf
Shorthand Format Controls 1BCA0..1BCAF 7.0  U1BCA0.pdf

A number of proposals for its inclusion have been submitted to the Unicode Technical Committee and WG2:

2009-05-03 Proposal to include Chinook Pipa script in UCS — Van Anderson ( L2/09-184)

2009-07-24 Proposal to include Chinook Pipa script in UCS — Van Anderson ( L2/09-283)

2009-10-06 Proposal to include Duployan Shorthands and Chinook script in UCS (Fonts+Data, Original HTML) — Van Anderson ( L2/09-364)

2010-01-31 Proposal to include Duployan Shorthands and Chinook script in UCS — Van Anderson ( L2/10-026)

2010-01-25 Duployan Charts — Van Anderson ( L2/10-027)

2010-01-25 Duployan Documentation — Van Anderson ( L2/10-028)

2010-05-03 Proposal to include Duployan Shorthands and Chinook script in UCS — Van Anderson ( L2/10-159)

2010-05-12 Guide to Duployan Shorthands and Stenographies — Van Anderson ( L2/10-201)

2010-05-12 Duployan Texts — Van Anderson ( L2/10-202)

2010-07-30 Proposal to include Duployan script and Shorthand Format Controls in UCS — Van Anderson ( WG2 N3895,  L2/10-272)

2010-09-21 On ordering and the proposed Duployan script for shorthands and Chinook — Michael Everson ( WG2 N3908,  L2/10-347)

2010-09-21 Response to Irish NB comments N3908 — Van Anderson ( WG2 N3922,  L2/10-352)

2010-10-03 Further discussion on ordering and the proposed Duployan script — Michael Everson ( WG2 N3931,  L2/10-364)

2010-10-05 Quick response to Irish NB comments N3931 — Van Anderson ( WG2 N3940,  L2/10-383)

2011-05-30 Resolving chart and collation order for the Duployan script — Van Anderson, Michael Everson ( WG2 N4088,  L2/11-215)

2011-07-19 Proposal to include Duployan Shorthands and Chinook script and Shorthand Format Controls in UCS, as approved by WG2 — Van Anderson ( L2/11-303)

2012-10-15 Duployan Letter Kk representative glyph change — Van Anderson ( L2/12-329)