It’s not impossible, you just need more Indian based merchants to be actively participating in the Arabian Sea trade rather than simply acting as vendors at the end of it. An easy way to do this would actually be to have the Great Kshatraps, the Scythian-descended rulers of Gujarat, Southern Rajasthan and chunks of Maharashtra defeat the Satavahana Empire which wasn’t as maritime, therefore leading to their ascendancy and ability to trade in peace.
When the Sadhavas of Kalinga and the various Tamil kingdoms were able to achieve this and simply project maritime power they converted and Indicized the majority of South-east Asia. With a permanent base in Socotra (which is an Arabicization of a Sanskrit word, and was already as staging base for Indian merchants OTL) they might be able to achieve similar things here. It’s also a prime moment for this to occur now because syncretisation is in full swing with Kushans promoting it in India proper with the rise of deities such as Oesho. The rites and worship of such deities can easily subsume the old Ethiopian deities such as Astar and Beher.
Or a different way to achieve this is for the Pandyan or Cheran kings to initiate the Indiacizatio. Of the Horn of Africa. Eventually the princes of Aksum may need legitimacy and they’ll invite Brahmins to legitimise them and marry the princesses of Pandyan descent to gain it, initiating a different sort of religious conversion via Vedic rites.