Use Ben Bloomfield’s Psalm Tone Tool if you must. Change the verses to gabc and the tone to in dir. monasticus. You may wish to adjust the metrum; the tool has to make choices for you, but might not do what you want.

But I’m going to push back. Pointing ensure that everyone knows exactly when to change pitch at any given time. The tonus indirectus of the monastic office is even easier than the Roman, but giving people pointed psalms is the way to go. This is what actual books have — if they have anything at all.

We sing Roman Vespers such that we will have months without more than one green Sunday, and they can handle pointing. The tool that you need is time.

I would add that the edge case for the fully sung office is if you really want people to know where the ictus is, with textual cases such as Dómino meo (where the otherwise weak final syllable of Dómino attracts the ictus over the accent of meo), when you have a departure from the reciting tone such that musical considerations override textual ones or where both come into play (e.g. an isolated syllable at the beginning of a verse or after the mediant) provided that you use the classical Solesmes method, but that hardly applies to monastic Compline since it's a more of a recitative formula.

But I don't necessarily think that one should sing from the score at the office. It's a practice tool and tends to get in the way. I don't even mark the psalms anymore, and I only really conduct the Magnificat actively out of the psalms and Gospel canticle.