Of course you are more or less certain of a win in the no tax jurisdiction unless the underlying is flat the whole time or your miss the time to realize the loss . As soon as the market moves in either direction you win on one leg. ...
In what you described so far is no such thing as "as the market moves in either direction you win on one leg". I think there is some missing here. You either described something different from what you actually have in mind, or I do not know what you mean.
In order to clear definitely up all the misconceptions and wild guesses, I think you should make a concrete example specifying:
1 where and when (one or multiple accounts) the trading happens
2. a concrete example of possible options configuration you have in mind, where you specify, for each option:
the instrument, strike price, signed position, you want to take and when
3. when and how you want to "close" part of all the options
(make sure the configuration is actually possible. That is, the instruments exist and are quoted)
Only given these elements, I think people can comment. Otherwise, it's just a mess of posters making all sorts of assumptions on tax avoidance strategies and incomprehensible statements on your part such as "you win on one leg", "covering the other part", "looking for a market neutral position", "more or less certain of a win in the no-tax jurisdiction", "achieve a market neutral portfolio without any risk", and so on, which are not compatible at all with "selling calls and puts".
> Currently planning on having the legs in the same account due to possible margin restraints
If that is the only reason, if you short them, it's not going to make any difference. In order to use the portfolio margining you need a different layout.
> The win from each OTM options would be very small
No. I begin to suspect that you are not grasping entirely the consequences of the trade. As explained already a couple of times, even with payoff charts, there is no difference in ITM or OTM for your configuration (strangle), apart from the bigger spread (and slightly larger "premium") of ITM.
>I would need strikes like 2400 and 4420 to feel comfortable risk-wise (30%). The strikes are far too close and I would run a suicidal risk with those strikes, I agree.
You are talking of the impossible. If you think of very far-away strikes, you cannot demand that they be available very short term, like a couple of weeks!
Who is so stupid to let you sell at that "distance"?
[maybe that is also the reason you cannot get the data
] Anyway, for a "broader" range of strikes, you may consider SPX (even though I do not favor it because for my personal trading I need things that run H24).
For available strikes at any expiration, you can look for instance on Barchart or other similar websites (or you can just use the IB API to retrieve the available strikes for each expiry)
https://www.barchart.com/futures/quotes/ES*0/options
https://www.cmegroup.com/markets/equities/sp/e-mini-sandp500.quotes.options.html
https://finance.yahoo.com/quote/^SPX/options/
https://bigcharts.marketwatch.com/quickchart/options.asp?symb=SPX
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