Key to pronunciation

I have so far tried to give pronunciation advice using Devanaagari script and approximations from actual words. But I feel the need to add IPA or some other standardised key. Here is a key that will apply to all names of Indian origin. For starters, all the parliamentary constituencies will follow this key. This covers only the vowels.

Symbol	Hindi sound	IPA	Like in word
a	अ	ʌ	but	तट
aa	आ	a:	father	बाप
i	इ	ɪ	pin	दिन
ii	ई	i:	peel	दीन
u	उ	ʊ	put	पुल
uu	ऊ	u:	pool	फूल
e	छोटा ए	ɛ	pen
ee	ए	e:	pay	देख
o	छोटा ओ	o	pot
oo	ओ	o:	poke	दो
ai	ऐ	ai	fight	कै
au	औ	au	aura	कॉल

ow          अउ                            brown     कौआ
ae           ऐ                                back        पैर