Can’t help you on the conversion specifics …… but just in case the next question is similar to other posters (I’ve converted to HPA - now how do I fill it?)
Does/do the site/sites you play at have HPA compressed air fills ?
If not, do you have plans for sufficient pre filled sources to cover a days play?
Are you aware that home compressors aren’t the best thing to have ?
Tyre compressors are out of the question
Workshop / tool compressors can be boosted in theory but at expense, concerns for air cleanliness and nasty things can occur
’Cheap’ (hundreds of £s) compressors do exist, but I’d still be wary of them - for low usage, and still need to be maintained & filtered for clean air etc
If home fills are necessary the best options are a scuba cylinder and fill station, or for occasional use and muscle building a stirrup pump