Two alternative forms of the same character

[shasso]

In Syriac, there are 3 characters, e.g. Meem (U0721), Noon (U0722), Kap (U071f) that have two altenartive canonical shapes. One is traditionally used when printed by itself, i.e. isolated form, and the other when used within a word and all the contextual shaping rules apply [all of the the three characters have two final forms shapes depending whether the preceding charcaters can connect to them]. Most of the other characters have 4 glyphs for nominal, init, medi, and fina forms. Except these 3 characters they have one additional isolated form. In theory, "salt" feature does not really apply here (this is an option users may choose) but in my case it is a mandatory requirement. Can this be done? if so, how?

Thanks,
Sargon

[arno]

It looks to me that it can be achieved, because it is done in ArabTypeSetting for Arab letter he.
he has an isolated form when within a word after a not-to-the-left-joining letter,
and an iso-iso form esp. in the abbreviation for hijri.
What is done there  is: the keystroke produces the iso-iso form, and
an <isol> lookup substitutes it after not-to-the-left-joining letters with the normal isol form.

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