Peter,
Any reason why you want to move to OAG ? Are you having trouble locking onto a good guide Star ?
Interested in your experience or problems
As your aware , OAG is generally to reduce weight, flexure problems with long OTA’s and for focal lengths greater than 1200mm
Both my rigs ( 900mm and 1000mm focal lengths ) have Orion 60mm guide scopes with an ZWOASI120MM-S USB3 guide camera using PHD2 Multistar guiding and it works really well , there’s always a good selection of guide stars for PHD2 to use ( unless your imaging some tiny remote galaxy somewhere with a limited star field )
Martin
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