Thank you for your detailed response.

"Do you think this advisable, do-able or do you envision problems?"

You've asked an opinion question. I'll offer a couple of opinions.

First, I never found any conflict between the Hebrew-based pentagram ritual and Raja Yoga work. (The nature of Raja Yoga almost precludes any such perception of conflict!) I could see a problem with Bhakti Yoga work where investment in the actuality of a specific deity matters more than anything; but, outside of Bhakti, that generally shouldn't be an issue.

Second, you will at least lose something critical in leaving the Hebrew. The four Divine Names used in the Pentagram Ritual are intimately numerically connected to the mathematics of a pentagram per se, and you lose everything that goes with that if you abandon those names.

"Some of the correspondances are easy to find in 777 such as the Godnames/Hindu Deities, but the Angels are trickier (though I should be able to find matching deities easily enough I guess).

Just wondering really if you'd advise against this, and also if 776 1/2 has any extra tables to aid if I did go down that route?"

It does have one table on Hiundu deities (#707) that is substantially the same as in 777.

For the archangel deva-substitutes, you might consider embodying the tattwas - using their colors and shapes as basic elements of visualizations of (or, of the auras of) generic spiritual beings. "Before me, Vayu," &c. But, if you do this, you might want to go clockwise around the circle instead of east-west then south-north, because you will then be following the exact sequence of the chakras. (Which then seems to require that whatever you do before that point establishes Akasha in a three-fold emergence, and... well, that should at least get you off and running.)